Konstantin Petrzhak: Difference between revisions

Konstantin Petrzhak
Konstantin Petrzhak
Константин Антонович Петржак
Born	September 4, 1907; Łuków, Congress Poland, Russian Empire; (now Łuków, Poland, or in Dombrovo, now Kaliningrad oblast, Russia)
Died	October 10, 1998 (aged 91); Russia
Nationality	Pole
Alma mater	Saint Petersburg State University
Known for	Discovery of spontaneous fission; Soviet nuclear program
Awards
	Scientific career
Fields	Physics (Nuclear)
Institutions	Khlopin Radium Institute; Saint Petersburg State Institute of Technology;
Doctoral advisor	Igor Kurchatov
Other academic advisors	Vitaly Khlopin

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Konstantin Petrzhak (alternatively Pietrzak;^[1] Russian: Константи́н Анто́нович Петржак, IPA: [kənstɐnʲˈtʲin ɐnˈtonəvʲɪtɕ pʲɛdʐak]; 1907–1998) was a Soviet–Russian nuclear physicist and university professor of Polish origin. He discovered spontaneous fission of uranium with Georgy Flyorov in 1940; in addition, he also aided in Soviet Union's atomic bomb project .^[2]

Biography

Konstantin Petrzhak was born on 4 September 1907^[3] in Łuków (Congress Poland, Russian Empire, now in Poland; another source also states he was born in Dombrovo, now Kaliningrad oblast. When Konstantin was 12 years old, he started working as a painter at a glass-making factory in Malaya Vishera (Russia). In 1928, he went to Saint-Petersburg to study at the rabfak of Saint Petersburg State University (then called Leningrad State University). In 1931, he joined a radiology group there.^[4] Konstantin Petrzhak completed his diploma under the supervision of Igor Kurchatov^[5] and graduated from Saint Petersburg State University in November 1936.

In 1934 he began work at Khlopin Radium Institute in Saint Petersburg (First Radium Institute),^[5] headed by Igor Kurchatov. Vitaly Khlopin and Kurchatov were his scientific supervisors. He worked there for the rest of his life.^[6] Konstantin Petrzhak wrote his Candidate of Sciences thesis, "study of thorium and samarium radioactivity".^[7]^[8] under Kurchatov's guidance. Petrzhak presented this paper at the Ioffe Institute.^[9]

In 1939, Igor Kurchatov asked Petrzhak and Georgy Flyorov to study uranium fission induced by neutrons of different energy levels, following Yakov Frenkel's^[10] theory of fission. Georgy Flyorov and [[Tatiana Nikitinskaya]] had already made an ionization chamber to detect heavy particles. Kurchatov asked Flyorov, Nikitinskaya and Petrzhak to increase the sensitivity of the ionization chamber.^[11] The team created a multilayer ionization chamber to detect decay products originating from the fission of uranium.^[12]^[13] The ionization chamber utilized electrodes with a total surface area of about 1000 cm².^[14] The chamber's 15 plates^[15] were covered with uranium oxide with approximate surface density of 10–20 mg/cm².^[12] The detector compared particle activity to a background level control.^[16] When the source of neutrons was taken away, the detector still found particles. The team made three ionization chambers to prove that the effect was not an error, including a more sensitive chamber with a surface area of 6000 cm². Despite the instrument's high sensitivity, cosmic rays were still a possible source of particle activity. The team moved to an underground lab in the Dinamo station of Moscow Metro (about 50 m below the earth surface)^[17] in an attempt to rule out the effects of cosmic rays. In May 1940, they were confident that they had discovered spontaneous fission.^[18] The certificate of discovery stated, "the new type of radioactivity with mother nucleus decays into two nuclei, that have kinetic energy of about 160 MeV".^[19]^[20] Later, the discovery of spontaneous fission was confirmed by Otto Robert Frisch.^[21]

In 1940, Petrzhak was recommended for the top team in the soviet atomic bomb project.^[22] He is rumored to have participated in said project.

When the Soviet Union entered World War II, Petrzhak was eligible to serve in the Red Army. Winning the Stalin Prize would exempt him from front line service. In the early 1940s, the Academy of Sciences of USSR nominated him for the award, which he did not receive.^[23] Sources disagree on whether Petrzhak volunteered,^[9] or was drafted^[24] into the army.

Petrzhak served in the military intelligence company of a CIWS regiment first as a junior lieutenant,^[25] and later as a senior lieutenant.^[26]^[27] On 28 June 1941, he participated in the battle of Karelian Isthmus. Later, he fought in Volkhov Front.^[24] In March 1942 he was ordered to leave the army^[6] and join evacuated Radium Institute scientists in Kazan.

In 1943, Petrzhak studied neutron induced fission of uranium under the supervision of professor Piotr Lukirski. In 1944, Petrzhak proposed a method to determine the number of neutrons present during a nuclear reaction, based on the number of protons. He also participated in the development of technology to extract plutonium from irradiated uranium blocks. Jointly with M. Yakunin, Petrzhak developed methods for the radiochemical determination of plutonium, and found the mean free path of Pu-239 alpha particles. Petrzhak founded a laboratory of neutron physics and nuclear fission at the Khlopin Radium Institute in 1947. He was the head of this laboratory until 1986,^[3] when he became a part-time contractor.

In 1949, Petrzhak was appointed a member of the Uranium Commission of the USSR Academy of Sciences.^[28] He was one of the founders of the Engineering faculty of the Saint Petersburg State Institute of Technology.^[29] Petrzhak founded the Saint Petersburg State Institute of Technology department of nuclear physics in 1949,^[3] and remained its chair for 22 years.^[30] In 1958, he supervised Vladimir Georgievich Korsakov's diploma work.^[31]

Konstantin Petrzhak created an express method to detect plutonium and associated radioisotopes in samples of irradiated uranium.^[3] From 1963 to 1976, he published a series of articles on the measurement of photofission.^[32]^[33] From 1973 through 1984, he took part in measuring induced fission cross-sections of U-238, U-235 and Pu-239 when irradiated by monoenergy neutrons^[34]^[35] In 1978, Konstantin Petrzhak co-authored a paper (with Yuri Oganessian and others) about synthesis of hassium performed in Joint Institute for Nuclear Research.^[36]

Petrzhak was doktor nauk (since 1948) and a professor. He was never elected an academician or the corresponding member of any academy, but Petrzhak was a member of Nuclear Physics Department of Russian Academy of Sciences.^[37] According to SCOPUS, Konstantin Petrzhak has 59 publications with Hirsch index 6.^[38] Konstantin Petrzhak published articles on fission products from nuclear reactors^[39] until his death in 1998. He died on October 10, 1998 and was buried in Saint Petersburg.

Personal life

Konstantin Petrzhak studied painting. He created paintings throughout his life. He used his skills in painting when he covered the plates of ionization chamber with uranium which later led to discovery of spontaneous fission. He was also an amateur violin and guitar player.^[40] Konstantin Petrzhak married Galina Ivanovna Mitrofanova (b. 1918), also a radiochemist.

Awards

1946 Stalin prize (2nd degree; jointly with Georgy Flyorov for discovery of spontaneous fission; 100000 Soviet roubles each;^[41])
1950 Council of Ministers Prize (for work on fulfillment of governmental tasks)
1953 USSR State Prize (for work on soviet atomic project)
1953 Order of the Red Banner of Labour (for work on soviet atomic project)
1957 Presidium of Academy of Sciences of USSR Prize

Selected works

Flerov GN, Petrzhak KA (1 July 1940). "Spontaneous fission of uranium". Phys. Rev. 58 (1): 89. doi:10.1103/PhysRev.58.89.2.
Adamov VM, Drapchinsky LV, Kovalenko SS, Petrzhak KA, Pleskachevsky LA, Tyutyugin II (1974). "Polar light particle emission in spontaneous fission of ²⁵²Cf". Physics Letters B. 48 (4): 311–314. doi:10.1016/0370-2693(74)90597-8.
Dushin, V.N.; Fomichev, A.V.; Kovalenko, S.S.; Petrzhak, K.A.; Shpakov, V.I.; Arlt, R.; Josch, M.; Muziol, G.; Ortlepp, H.G.; Wagner W. (1982). "Statistical analysis of the experimental data of fission cross section measurements on ^{233, 235, 238}U, ²³⁷Np, ^{239, 242}Pu at neutron energies of 2.5, 8.4 and 14.5 MeV". Proc. of XIIth International symp. on nuclear physics. Gaussig, 1982, ZfK-491. Dresden. p. 138.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: multiple names: authors list (link)
Спонтанное деление урана [Spontaneous fission of uranium]. ЖЭТФ (in Russian). 10: 10–13. 1940. {{cite journal}}: Unknown parameter |authors= ignored (help)
Спонтанное деление урана [Spontaneous fission of uranium]. УФН (in Russian). 25 (2): 241. 1941. {{cite journal}}: Unknown parameter |authors= ignored (help)

Notes

^ Константин Антонович Петржак (Konstantin Pietrzak). Ядерная физика в Интернете (in Russian). Retrieved November 10, 2014.
^ Petrzhak KA, Flerov GN (1940). "Spontaneous fission of uranium". Proc USSR Acad Sci. 28 (6): 500.
^ ^a ^b ^c ^d "Konstantin Petrzhak" Константин Петржак. Russian Engineers (in Russian). 2010.
^ Драпчинский, Л.В. К 100-летию со дня рождения К.А. Петржака [To 100-year anniversary of K. A. Petrzhak]. Семейные истории. Retrieved October 31, 2014.
^ ^a ^b Асташенков 1968, p. 92.
^ ^a ^b Konstantin Petrzhak obituary
^ Гринберг, А.П.; Френкель, В.Я. (1984). Igor Vasilyevich Kurchatov in Ioffe Institute (1925-1943) Игорь Васильевич Курчатов в Физико-техническом институте (1925-1943 гг.). Ленинград: Наука. p. 181. Retrieved November 12, 2014.
^ Иоффе, А. Ф. (1985). "Открытие молодых советских ученых". О физике и физиках (PDF). Наука. Мировоззрение. Жизнь (2 ed.). Ленинград.: Наука. Ленинградское отделение. Retrieved October 31, 2014. {{cite book}}: Unknown parameter |trans_title= ignored (|trans-title= suggested) (help)
^ ^a ^b Гапонов Ю. В. (2003). Игорь Васильевич Курчатов (1903-1960). Жизненный путь (К столетию со дня рождения) [Igor Vasilievich Kurchatov (1903-1960). Life way (to 100th anniversary)]. Физика элементарных частиц и атомного ядра. 34 (3): 530.
^ Отто Ган [Otto Hahn] (in Russian).
^ Асташенков 1968, p. 93.
^ ^a ^b Мухин 1974, p. 477.
^ Oganessian, Yuri (2003). Г. Н. Флёров. Молодые годы [G. Flyorov. Early years] (DOC) (in Russian). {{cite web}}: Cite has empty unknown parameter: |1= (help)
^ Кузнецова, Р.В. Многослойная ионизационная камера [Multilayer ionization chamber]. Приборы и инструменты России (in Russian). p. 15.
^ Мухин 1974, p. 478.
^ Flerov GN, Petrzhak KA (1961). Спонтанное деление ядер [Spontaneous fission of nuclei] (PDF). Physics-Uspekhi (in Russian). LXXIII (4): 657.
^ Асташенков 1968, p. 96.
^ Paul Kuroda (2012). "The Origin of the Chemical Elements and the Oklo Phenomenon". Springer Science & Business Media. p. 32. ISBN 3642686672.
^ Открытие спонтанного деления урана [Discovery of spontaneous fission in uranium] (in Russian).
^ Флеров, Петржак – Научное открытие №33 Спонтанное деление ядер урана [Flerov, Petrzhak - Scientific discovery №33. Spontaneous fission of uranium]. Научные открытия России (in Russian). Archived from the original on 25 January 2012. Retrieved October 24, 2014.
^ О создании первой отечественной атомной бомбы [About the creation of the first national atomic bomb] (PDF). УФН (in Russian). 171 (1): 83. 2001. {{cite journal}}: Unknown parameter |authors= ignored (help)
^ Создание первой атомной бомбы в СССР [Works on creation of the first atomic bomb in USSR]. "BioFile.ru" (in Russian).
^ Губарев, B.C. (2000). XX век. Исповеди: судьба науки и ученых в России. [20th century. Confessions: the destiny of science and scientists of Russia.] (in Russian). М.: МАИК "Наука/Интерпериодика". ISBN 5-7846-0034-6. Retrieved October 31, 2014.
^ ^a ^b Рояль эмоций, Творцы - ч. 170 [Grand piano of emotions. Creators, part 170] (in Russian). Archived from the original on October 31, 2014. Retrieved October 31, 2014.
^ РФЯЦ-ВНИИЭФ 2000, p. 426.
^ Зенькович, Николай (2004). Тайны ушедшего века. Власть. Распри. Подоплека [Mysteries of the passing century. Power. Arguments. Causes.] (in Russian). Moscow: ОЛМА Медиа Групп. ISBN 5224046769. Retrieved October 22, 2014.
^ Крюков, С.Г. Достоин ли А. Сахаров почестей? [Whether A. Sakharov is worth ceremonial?]. Своими именами (in Russian). Retrieved October 31, 2014.
^ А.С. Дудырев; А.А. Копырин; Б.А. Лавров; А.А. Малыгин; В.Н. Нараев; А.А. Персинен; В.И. Штанько (2008). Наукоемкие технологии в начале XXI века [High technologies at the beginning of 21th century] (PDF). Известия Санкт-Петербургского государственного технологического института (in Russian) (4(30)): 80.
^ Выпускники и преподаватели [Alumni and Faculty]. Saint Petersburg State Institute of Technology (in Russian).
^ История кафедры [History of department]. Saint Petersburg State Institute of Technology (in Russian).
^ Сырков, А.Г.; Малыгин, А.А.; Сычев, М.М. (2014). К 80-летию со дня рождения профессора В.Г. Корсакова [On 80 years of V. G. Korsakov]. Известия Санкт-Петербургского государственного технологического института (in Russian) (24(50)): 104.
^ Kondrat'ko, M. Ya.; Korinets, V. N.; Petrzhak, K. A. (1976). "Dependence of asymmetry in the photofission of ²³³U and ²³⁹Pu on the maximum bremsstrahlung". Soviet Atomic Energy. 40 (1): 83–84. doi:10.1007/BF01119404.
^ Запаздывающие нейтроны при фотоделении [Delayed neutrons during photofission] (in Russian). 15. 1963: 157–158. {{cite journal}}: Cite journal requires |journal= (help); Unknown parameter |authors= ignored (help)
^ Алхазов, И.Д.; Касаткин, В.П; Косточкин, О.И.; Малкин, Л.З.; Сорокина, A.B.; Петржак, К.А.; Фомичёв, A.B.; Шпаков, В.И.; Румянцев, Б.В.; Соколов A.M. (1974). "Измерение сечения деления 238U нейтронами с энергией 14,6 МэВ" [Measurements of cross-sections of U-238 fission when irradiated with neutrons of energy 14.5 MeV]. Нейтронная физика, Материалы II Всесоюзной конференции по нейтронной физике, Киев, 1973 [Neutron physics, proceedings of II USSR conference on neutron physics, Kiev, 1973] (in Russian). Vol. 4. Обнинск. pp. 13–17.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: multiple names: authors list (link)
^ Dushin, V. N.; Fomichev, A. V.; Kovalenko, S. S.; Petrzhak, K. A.; Shpakov, V. I.; Arl't, R.; Iosh, M.; Muziol', G.; Ortlepp, Kh.-G.; Vagner, V. (1983). "Statistical analysis of experimental data on the cross sections of ^{233, 235, 238}U, ²³⁷Np, ^239,242Pu fission by neutrons of energy 2.6, 8.5, and 14.5 MeV". Soviet Atomic Energy. 55 (4): 656–660. doi:10.1007/BF01124127.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ Оганесян, Ю.Ц.; Тер-Акопьян, Г.М.; Плеве, А.А.; Чепигин, В.И.; Орлова, О.А.; Зайдель, В.; Селицкий, Ю.А.; Фунштейн, В.Б.; Брухертзайфер, Х.; Константинеску, О.; Шварценберг, М.; Гаврилов, К.А.; Коваленко, С.С.; Петржак, К.А. Опыты по синтезу 108 элемента в реакции ²²⁶Ra + ⁴⁸Ca [Experiments on synthesis of 108th element in reaction ²²⁶Ra + ⁴⁸Ca] (PDF) (in Russian).{{cite web}}: CS1 maint: multiple names: authors list (link)
^ "Members of Nuclear Physics Division of Physical Sciences Department of Russian Academy of Sciences". High Energy and Nuclear Physics in Russia.
^ K. A. Petrzhak SCOPUS
^ Teplykh, V. F.; Platygina, E. V.; Petrzhak, K. A. (1998). "Range of products with A=131–136 in the reactor neutron fission of ²³⁷Np, ²⁴³Am by and thermal neutron fission of ²³³U, ²³⁵U, and ²³⁹Pu". Atomic Energy. 84 (4): 292–294. doi:10.1007/BF02415238.
^ Холодная, Варвара (5 June 2009). Не пропусти! [Do not miss]. Вечерний Петербург (in Russian). No. 102 (23946). Retrieved December 22, 2014.
^ "Russian discovery of atomic secrets". The Canberra Times. Vol. 20, no. 5869. January 29, 1946. p. 1.

References

Асташенков, Петр Тимофеевич (1968). Курчатов. М.: Молодая гвардия. p. 24. {{cite book}}: Invalid |ref=harv (help); Unknown parameter |trans_title= ignored (|trans-title= suggested) (help)
Мухин, К.Н. (1974). Экспериментальная ядерная физика [Experimental nuclear physics] (in Russian). Vol. 1. М.: Атомиздат. p. 477. {{cite book}}: Invalid |ref=harv (help)
Взаимодействие излучений с ядрами тяжелых элементов и деление ядер. Справочник. [Interaction of radiation with nuclei of heavy elements and nuclear fission. Reference] (in Russian). М.: Атомиздат. 1976. {{cite book}}: Unknown parameter |authors= ignored (help)
Рябев, Л. Д., ed. (2000). Атомный проект СССР. Том II. 1945-1954 Книга 2 (in Russian). Vol. II. Москва-Саров: РФЯЦ-ВНИИЭФ. ISBN 5-85165-402-3. {{cite book}}: Invalid |script-title=: missing prefix (help); Unknown parameter |trans_title= ignored (|trans-title= suggested) (help)

[1] Константин Антонович Петржак (Konstantin Pietrzak). Ядерная физика в Интернете (in Russian). Retrieved November 10, 2014.

[2] Petrzhak KA, Flerov GN (1940). "Spontaneous fission of uranium". Proc USSR Acad Sci. 28 (6): 500.

[rus-eng-3] "Konstantin Petrzhak" Константин Петржак. Russian Engineers (in Russian). 2010.

[4] Драпчинский, Л.В. К 100-летию со дня рождения К.А. Петржака [To 100-year anniversary of K. A. Petrzhak]. Семейные истории. Retrieved October 31, 2014.

[FOOTNOTEАсташенков196892-5] Асташенков 1968, p. 92.

[obituary-6] Konstantin Petrzhak obituary

[7] Гринберг, А.П.; Френкель, В.Я. (1984). Igor Vasilyevich Kurchatov in Ioffe Institute (1925-1943) Игорь Васильевич Курчатов в Физико-техническом институте (1925-1943 гг.). Ленинград: Наука. p. 181. Retrieved November 12, 2014.

[8] Иоффе, А. Ф. (1985). "Открытие молодых советских ученых". О физике и физиках (PDF). Наука. Мировоззрение. Жизнь (2 ed.). Ленинград.: Наука. Ленинградское отделение. Retrieved October 31, 2014. {{cite book}}: Unknown parameter |trans_title= ignored (|trans-title= suggested) (help)

[Kurchatov-9] Гапонов Ю. В. (2003). Игорь Васильевич Курчатов (1903-1960). Жизненный путь (К столетию со дня рождения) [Igor Vasilievich Kurchatov (1903-1960). Life way (to 100th anniversary)]. Физика элементарных частиц и атомного ядра. 34 (3): 530.

[10] Отто Ган [Otto Hahn] (in Russian).

[FOOTNOTEАсташенков196893-11] Асташенков 1968, p. 93.

[FOOTNOTEМухин1974477-12] Мухин 1974, p. 477.

[13] Oganessian, Yuri (2003). Г. Н. Флёров. Молодые годы [G. Flyorov. Early years] (DOC) (in Russian). {{cite web}}: Cite has empty unknown parameter: |1= (help)

[14] Кузнецова, Р.В. Многослойная ионизационная камера [Multilayer ionization chamber]. Приборы и инструменты России (in Russian). p. 15.

[FOOTNOTEМухин1974478-15] Мухин 1974, p. 478.

[16] Flerov GN, Petrzhak KA (1961). Спонтанное деление ядер [Spontaneous fission of nuclei] (PDF). Physics-Uspekhi (in Russian). LXXIII (4): 657.

[FOOTNOTEАсташенков196896-17] Асташенков 1968, p. 96.

[18] Paul Kuroda (2012). "The Origin of the Chemical Elements and the Oklo Phenomenon". Springer Science & Business Media. p. 32. ISBN 3642686672.

[19] Открытие спонтанного деления урана [Discovery of spontaneous fission in uranium] (in Russian).

[20] Флеров, Петржак – Научное открытие №33 Спонтанное деление ядер урана [Flerov, Petrzhak - Scientific discovery №33. Spontaneous fission of uranium]. Научные открытия России (in Russian). Archived from the original on 25 January 2012. Retrieved October 24, 2014.

[21] О создании первой отечественной атомной бомбы [About the creation of the first national atomic bomb] (PDF). УФН (in Russian). 171 (1): 83. 2001. {{cite journal}}: Unknown parameter |authors= ignored (help)

[22] Создание первой атомной бомбы в СССР [Works on creation of the first atomic bomb in USSR]. "BioFile.ru" (in Russian).

[23] Губарев, B.C. (2000). XX век. Исповеди: судьба науки и ученых в России. [20th century. Confessions: the destiny of science and scientists of Russia.] (in Russian). М.: МАИК "Наука/Интерпериодика". ISBN 5-7846-0034-6. Retrieved October 31, 2014.

[Grand_piano-24] Рояль эмоций, Творцы - ч. 170 [Grand piano of emotions. Creators, part 170] (in Russian). Archived from the original on October 31, 2014. Retrieved October 31, 2014.

[FOOTNOTEРФЯЦ-ВНИИЭФ2000426-25] РФЯЦ-ВНИИЭФ 2000, p. 426.

[26] Зенькович, Николай (2004). Тайны ушедшего века. Власть. Распри. Подоплека [Mysteries of the passing century. Power. Arguments. Causes.] (in Russian). Moscow: ОЛМА Медиа Групп. ISBN 5224046769. Retrieved October 22, 2014.

[27] Крюков, С.Г. Достоин ли А. Сахаров почестей? [Whether A. Sakharov is worth ceremonial?]. Своими именами (in Russian). Retrieved October 31, 2014.

[28] А.С. Дудырев; А.А. Копырин; Б.А. Лавров; А.А. Малыгин; В.Н. Нараев; А.А. Персинен; В.И. Штанько (2008). Наукоемкие технологии в начале XXI века [High technologies at the beginning of 21th century] (PDF). Известия Санкт-Петербургского государственного технологического института (in Russian) (4(30)): 80.

[29] Выпускники и преподаватели [Alumni and Faculty]. Saint Petersburg State Institute of Technology (in Russian).

[30] История кафедры [History of department]. Saint Petersburg State Institute of Technology (in Russian).

[31] Сырков, А.Г.; Малыгин, А.А.; Сычев, М.М. (2014). К 80-летию со дня рождения профессора В.Г. Корсакова [On 80 years of V. G. Korsakov]. Известия Санкт-Петербургского государственного технологического института (in Russian) (24(50)): 104.

[32] Kondrat'ko, M. Ya.; Korinets, V. N.; Petrzhak, K. A. (1976). "Dependence of asymmetry in the photofission of ²³³U and ²³⁹Pu on the maximum bremsstrahlung". Soviet Atomic Energy. 40 (1): 83–84. doi:10.1007/BF01119404.

[33] Запаздывающие нейтроны при фотоделении [Delayed neutrons during photofission] (in Russian). 15. 1963: 157–158. {{cite journal}}: Cite journal requires |journal= (help); Unknown parameter |authors= ignored (help)

[34] Алхазов, И.Д.; Касаткин, В.П; Косточкин, О.И.; Малкин, Л.З.; Сорокина, A.B.; Петржак, К.А.; Фомичёв, A.B.; Шпаков, В.И.; Румянцев, Б.В.; Соколов A.M. (1974). "Измерение сечения деления 238U нейтронами с энергией 14,6 МэВ" [Measurements of cross-sections of U-238 fission when irradiated with neutrons of energy 14.5 MeV]. Нейтронная физика, Материалы II Всесоюзной конференции по нейтронной физике, Киев, 1973 [Neutron physics, proceedings of II USSR conference on neutron physics, Kiev, 1973] (in Russian). Vol. 4. Обнинск. pp. 13–17.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: multiple names: authors list (link)

[35] Dushin, V. N.; Fomichev, A. V.; Kovalenko, S. S.; Petrzhak, K. A.; Shpakov, V. I.; Arl't, R.; Iosh, M.; Muziol', G.; Ortlepp, Kh.-G.; Vagner, V. (1983). "Statistical analysis of experimental data on the cross sections of ^{233, 235, 238}U, ²³⁷Np, ^239,242Pu fission by neutrons of energy 2.6, 8.5, and 14.5 MeV". Soviet Atomic Energy. 55 (4): 656–660. doi:10.1007/BF01124127.{{cite journal}}: CS1 maint: multiple names: authors list (link)

[36] Оганесян, Ю.Ц.; Тер-Акопьян, Г.М.; Плеве, А.А.; Чепигин, В.И.; Орлова, О.А.; Зайдель, В.; Селицкий, Ю.А.; Фунштейн, В.Б.; Брухертзайфер, Х.; Константинеску, О.; Шварценберг, М.; Гаврилов, К.А.; Коваленко, С.С.; Петржак, К.А. Опыты по синтезу 108 элемента в реакции ²²⁶Ra + ⁴⁸Ca [Experiments on synthesis of 108th element in reaction ²²⁶Ra + ⁴⁸Ca] (PDF) (in Russian).{{cite web}}: CS1 maint: multiple names: authors list (link)

[37] "Members of Nuclear Physics Division of Physical Sciences Department of Russian Academy of Sciences". High Energy and Nuclear Physics in Russia.

[38] K. A. Petrzhak SCOPUS

[39] Teplykh, V. F.; Platygina, E. V.; Petrzhak, K. A. (1998). "Range of products with A=131–136 in the reactor neutron fission of ²³⁷Np, ²⁴³Am by and thermal neutron fission of ²³³U, ²³⁵U, and ²³⁹Pu". Atomic Energy. 84 (4): 292–294. doi:10.1007/BF02415238.

[40] Холодная, Варвара (5 June 2009). Не пропусти! [Do not miss]. Вечерний Петербург (in Russian). No. 102 (23946). Retrieved December 22, 2014.

[41] "Russian discovery of atomic secrets". The Canberra Times. Vol. 20, no. 5869. January 29, 1946. p. 1.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

[14]

[15]

[16]

[17]

[18]

[19]

[20]

[21]

[22]

[23]

[24]

[25]

[26]

[27]

[28]

[29]

[30]

[31]

[32]

[33]

[34]

[35]

[36]

[37]

[38]

[39]

[40]

[41]

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 In 1934 he began work at [[V. G. Khlopin Radium Institute|Khlopin Radium Institute]] in Saint Petersburg (First Radium Institute),{{sfn|Асташенков|1968|p=92}} headed by [[Igor Kurchatov]]. [[Vitaly Khlopin]] and Kurchatov were his scientific supervisors. He worked there for the rest of his life.<ref name=obituary>[http://www.ruhep.ru/obituary/petrzhak.htm Konstantin Petrzhak obituary]</ref>  Konstantin Petrzhak wrote his [[Candidate of Sciences]] thesis, "study of thorium and samarium radioactivity".<ref>{{cite book |last1=Гринберг |first1=А.П. |last2=Френкель |first2=В.Я. |year=1984|title=Igor Vasilyevich Kurchatov in Ioffe Institute (1925-1943)|script-title=ru:Игорь Васильевич Курчатов в Физико-техническом институте (1925-1943 гг.) |url=http://physiclib.ru/books/item/f00/s00/z0000027/st040.shtml |location=Ленинград |publisher=Наука |pages=181 |accessdate=November 12, 2014 }}</ref><ref>{{cite book |last=Иоффе |first=А. Ф. |year=1985 |script-title=ru:О физике и физиках |trans_title=About physics and physicists|chapter=Открытие молодых советских ученых |url=http://alexandr4784.narod.ru/ioffe/ioffe_1_10.pdf|edition=2 |location=Ленинград. |publisher=Наука. Ленинградское отделение |accessdate=October 31, 2014|series=Наука. Мировоззрение. Жизнь }}</ref> under Kurchatov's guidance. Petrzhak presented this paper at the [[Ioffe Institute]].<ref name=Kurchatov>{{Cite journal|author=Гапонов Ю. В. |url=http://nuclphys.sinp.msu.ru/radioactivity/ract07.htm|script-title=ru:Игорь Васильевич Курчатов (1903-1960). Жизненный путь (К столетию со дня рождения)|trans-title=Igor Vasilievich Kurchatov (1903-1960). Life way (to 100th anniversary) |journal=Физика элементарных частиц и атомного ядра|year=2003|volume=34|issue=3|pages=530}}</ref>
-In 1939, Igor Kurchatov asked Petrzhak and [[Georgy Flyorov]] to study uranium fission induced by neutrons of different energy levels, following [[Yakov Frenkel]]'s<ref>{{Cite web|url=http://allreferat.org.ua/referat/71686/referat_from_site_www.allreferat.org.ua_.rtf|language=Russian|script-title=ru:Отто Ган|trans-title=Otto Hahn}}</ref> theory of fission. Georgy Flyorov and <nowiki>[[Tatiana Nikitinskaya]]</nowiki> had already made an ionization chamber to detect heavy particles. Kurchatov asked Flyorov, Nikitinskaya and Petrzhak to increase the sensitivity of the ionization chamber.{{sfn|Асташенков|1968|p=93}} The team created a multilayer [[ionization chamber]] to detect [[decay product]]s originating from the fission of uranium.{{sfn|Мухин|1974|p=477}}<ref>{{cite web |url=http://flerovlab.jinr.ru/linkc/flerov/doc/%D0%A4%D0%BB%D1%91%D1%80%D0%BE%D0%B2%20(%D0%B1%D0%B8%D0%BE%D0%B3%D1%80%D0%B0%D1%84%D0%B8%D1%8F)%20%D1%81%D1%82%D0%B0%D1%82%D1%8C%D1%8F%20%D0%B2%20%D0%94%D1%83%D0%B1%D0%BD%D1%83.doc| trans-title=G. Flyorov. Early years |script-title=ru:Г. Н. Флёров. Молодые годы |format=DOC|last=Oganessian |first=Yuri |authorlink=Yuri Oganessian |year=2003 |language=ru|}}</ref> The ionization chamber utilized electrodes with a total surface area of about 1000&nbsp;cm<sup>2</sup>.<ref>{{cite web |url=http://files.school-collection.edu.ru/dlrstore/bab9ee0a-7e14-4561-890b-b29ca67435ce/KameraMnogoslojnajaIonizacionnaja-opis.htm |trans-title=Multilayer ionization chamber |script-title=ru:Многослойная ионизационная камера |last=Кузнецова|first=Р.В.|language=ru|page=15|website=Приборы и инструменты России}}</ref>  The chamber's 15 plates{{sfn|Мухин|1974|p=478}} were covered with uranium oxide with approximate surface density of 10–20&nbsp;mg/cm<sup>2</sup>.{{sfn|Мухин|1974|p=477}}  The detector compared particle activity to a background level control.<ref>{{cite journal |author=[[Georgy Flyorov|Flerov GN]], '''Petrzhak KA'''|year=1961 |script-title=ru:Спонтанное деление ядер| trans-title =Spontaneous fission of nuclei | language = Russian |url=http://nuclphys.sinp.msu.ru/UFN/r614f.pdf |journal=Physics-Uspekhi |volume=LXXIII |issue=4 |pages=657 }}</ref> When the source of neutrons was taken away, the detector still found particles. The team made three ionization chambers to prove that the effect was not an error, including a more sensitive chamber with a surface area of 6000&nbsp;cm<sup>2</sup>. Despite the instrument's high sensitivity, cosmic rays were still a possible source of particle activity. The team moved to an underground lab in the [[Dinamo (Moscow Metro)|Dinamo station]] of Moscow Metro (about 50 m below the earth surface){{sfn|Асташенков|1968|p=96}} in an attempt to rule out the effects of cosmic rays. In May 1940, they were confident that they had discovered [[spontaneous fission]].<ref>{{cite web |url=https://books.google.by/books?id=Gav7CAAAQBAJ&pg=PA32&lpg=PA32&dq=%22spontaneous+fission%22+discovery+1940&source=bl&ots=xcDpgwcvds&sig=PwwxCu3f_THJ_DE4Suz2bXEnL1k&hl=en&sa=X&ved=0CCsQ6AEwA2oVChMIrJWK2YCDyAIVCbwaCh1kZgPg#v=onepage&q&f=false |title=The Origin of the Chemical Elements and the Oklo Phenomenon|author=[[Paul Kuroda]] |isbn=3642686672|year=2012|publisher=Springer Science & Business Media|pages=32}}</ref> The certificate of discovery stated, "the new type of radioactivity with mother nucleus decays into two nuclei, that have kinetic energy of about 160 MeV".<ref>{{cite web |url=http://www.aes1.ru/mission/dates/d11 |trans-title=Discovery of spontaneous fission in uranium |script-title=ru:Открытие спонтанного деления урана |language=ru}}</ref><ref>{{cite web |url=http://ross-nauka.narod.ru/04/04-033.html |trans-title=Flerov, Petrzhak - Scientific discovery №33. Spontaneous fission of uranium |script-title=ru:Флеров, Петржак – Научное открытие №33 Спонтанное деление ядер урана |accessdate=October 24, 2014|website=Научные открытия России| language =ru |archiveurl=https://web.archive.org/web/20120125194736/http://ross-nauka.narod.ru/04/04-033.html|archivedate=25 January 2012}}</ref> Later, the discovery of spontaneous fission was confirmed by [[Otto Robert Frisch]].<ref>{{cite journal|script-title=ru:О создании первой отечественной атомной бомбы|pages=83|trans-title=About the creation of the first national atomic bomb|authors=Гончаров Г. А.; Рябев Л. Д.|journal=УФН|year=2001|volume=171|number=1|language=Russian|url=http://elibrary.lt/resursai/Uzsienio%20leidiniai/Uspechi_Fiz_Nauk/2001/N01/2001-1-03.pdf}}</ref>
+In 1939, Igor Kurchatov asked Petrzhak and [[Georgy Flyorov]] to study uranium fission induced by neutrons of different energy levels, following [[Yakov Frenkel]]'s<ref>{{Cite web|url=http://allreferat.org.ua/referat/71686/referat_from_site_www.allreferat.org.ua_.rtf|language=Russian|script-title=ru:Отто Ган|trans-title=Otto Hahn}}</ref> theory of fission. Georgy Flyorov and <nowiki>[[Tatiana Nikitinskaya]]</nowiki> had already made an ionization chamber to detect heavy particles. Kurchatov asked Flyorov, Nikitinskaya and Petrzhak to increase the sensitivity of the ionization chamber.{{sfn|Асташенков|1968|p=93}} The team created a multilayer [[ionization chamber]] to detect [[decay product]]s originating from the fission of uranium.{{sfn|Мухин|1974|p=477}}<ref>{{cite web |url=http://flerovlab.jinr.ru/linkc/flerov/doc/%D0%A4%D0%BB%D1%91%D1%80%D0%BE%D0%B2%20(%D0%B1%D0%B8%D0%BE%D0%B3%D1%80%D0%B0%D1%84%D0%B8%D1%8F)%20%D1%81%D1%82%D0%B0%D1%82%D1%8C%D1%8F%20%D0%B2%20%D0%94%D1%83%D0%B1%D0%BD%D1%83.doc| trans-title=G. Flyorov. Early years |script-title=ru:Г. Н. Флёров. Молодые годы |format=DOC|last=Oganessian |first=Yuri |authorlink=Yuri Oganessian |year=2003 |language=ru|}}</ref> The ionization chamber utilized electrodes with a total surface area of about 1000&nbsp;cm<sup>2</sup>.<ref>{{cite web |url=http://files.school-collection.edu.ru/dlrstore/bab9ee0a-7e14-4561-890b-b29ca67435ce/KameraMnogoslojnajaIonizacionnaja-opis.htm |trans-title=Multilayer ionization chamber |script-title=ru:Многослойная ионизационная камера |last=Кузнецова|first=Р.В.|language=ru|page=15|website=Приборы и инструменты России}}</ref>  The chamber's 15 plates{{sfn|Мухин|1974|p=478}} were covered with uranium oxide with approximate surface density of 10–20&nbsp;mg/cm<sup>2</sup>.{{sfn|Мухин|1974|p=477}}  The detector compared particle activity to a background level control.<ref>{{cite journal |author=[[Georgy Flyorov|Flerov GN]], '''Petrzhak KA'''|year=1961 |script-title=ru:Спонтанное деление ядер| trans-title =Spontaneous fission of nuclei | language = Russian |url=http://nuclphys.sinp.msu.ru/UFN/r614f.pdf |journal=Physics-Uspekhi |volume=LXXIII |issue=4 |pages=657 }}</ref> When the source of neutrons was taken away, the detector still found particles. The team made three ionization chambers to prove that the effect was not an error, including a more sensitive chamber with a surface area of 6000&nbsp;cm<sup>2</sup>. Despite the instrument's high sensitivity, cosmic rays were still a possible source of particle activity. The team moved to an underground lab in the [[Dinamo (Moscow Metro)|Dinamo station]] of Moscow Metro (about 50 m below the earth surface){{sfn|Асташенков|1968|p=96}} in an attempt to rule out the effects of cosmic rays. In May 1940, they were confident that they had discovered [[spontaneous fission]].<ref>{{cite web |url=https://books.google.com/books?id=Gav7CAAAQBAJ&pg=PA32&lpg=PA32&dq=%22spontaneous+fission%22+discovery+1940&source=bl&ots=xcDpgwcvds&sig=PwwxCu3f_THJ_DE4Suz2bXEnL1k&hl=en&sa=X&ved=0CCsQ6AEwA2oVChMIrJWK2YCDyAIVCbwaCh1kZgPg#v=onepage&q&f=false |title=The Origin of the Chemical Elements and the Oklo Phenomenon|author=[[Paul Kuroda]] |isbn=3642686672|year=2012|publisher=Springer Science & Business Media|pages=32}}</ref> The certificate of discovery stated, "the new type of radioactivity with mother nucleus decays into two nuclei, that have kinetic energy of about 160 MeV".<ref>{{cite web |url=http://www.aes1.ru/mission/dates/d11 |trans-title=Discovery of spontaneous fission in uranium |script-title=ru:Открытие спонтанного деления урана |language=ru}}</ref><ref>{{cite web |url=http://ross-nauka.narod.ru/04/04-033.html |trans-title=Flerov, Petrzhak - Scientific discovery №33. Spontaneous fission of uranium |script-title=ru:Флеров, Петржак – Научное открытие №33 Спонтанное деление ядер урана |accessdate=October 24, 2014|website=Научные открытия России| language =ru |archiveurl=https://web.archive.org/web/20120125194736/http://ross-nauka.narod.ru/04/04-033.html|archivedate=25 January 2012}}</ref> Later, the discovery of spontaneous fission was confirmed by [[Otto Robert Frisch]].<ref>{{cite journal|script-title=ru:О создании первой отечественной атомной бомбы|pages=83|trans-title=About the creation of the first national atomic bomb|authors=Гончаров Г. А.; Рябев Л. Д.|journal=УФН|year=2001|volume=171|number=1|language=Russian|url=http://elibrary.lt/resursai/Uzsienio%20leidiniai/Uspechi_Fiz_Nauk/2001/N01/2001-1-03.pdf}}</ref>
 In 1940, Petrzhak was recommended for the top team in the [[soviet atomic bomb project]].<ref>{{cite web |url=http://biofile.ru/his/528.html |trans-title=Works on creation of the first atomic bomb in USSR |script-title=ru:Создание первой атомной бомбы в СССР |website="BioFile.ru" |language=ru}}</ref> He is rumored to have participated in said project.
@@ Line 36: / Line 36: @@
 When the [[Soviet Union]] entered World War II, Petrzhak was eligible to serve in the [[Red Army]]. Winning the Stalin Prize would exempt him from front line service. In the early 1940s, the Academy of Sciences of USSR nominated him for the award, which he did not receive.<ref>{{cite book |last=Губарев |first=B.C. |year=2000 |script-title=ru:XX век. Исповеди: судьба науки и ученых в России.|trans-title=20th century. Confessions: the destiny of science and scientists of Russia. |url=http://textarchive.ru/c-2437582-p3.html |language= Russian|location=М. |publisher=[[МАИК "Наука/Интерпериодика"]] |isbn=5-7846-0034-6 |accessdate=October 31, 2014}}</ref> Sources disagree on whether Petrzhak volunteered,<ref name="Kurchatov" /> or was drafted<ref name="Grand piano">{{cite web |url=http://ugservis23.ru/library/rojal-jemocij/tvorcy-ch-170.html |script-title=ru:Рояль эмоций, Творцы - ч. 170|trans-title=Grand piano of emotions. Creators, part 170|language=Russian|accessdate=October 31, 2014|archiveurl=https://web.archive.org/web/20141031105734/http://ugservis23.ru/library/rojal-jemocij/tvorcy-ch-170.html|archivedate=October 31, 2014}}</ref> into the army.
-Petrzhak served in the military intelligence company of a [[Close-in weapon system|CIWS]] regiment first as a junior lieutenant,{{sfn |РФЯЦ-ВНИИЭФ|2000|p=426}} and later as a senior lieutenant.<ref>{{cite book |last=Зенькович |first=Николай |date=2004 |script-title=ru:Тайны ушедшего века. Власть. Распри. Подоплека |trans-title=Mysteries of the passing century. Power. Arguments. Causes. |url=http://books.google.by/books?id=3oVYMfHhrnEC&pg=PA204&lpg=PA204&dq=%D0%9F%D0%B5%D1%82%D1%80%D0%B6%D0%B0%D0%BA+%D0%91%D0%BE%D0%BC%D0%B1%D0%B0&source=bl&ots=RDQWEMt0tj&sig=tDe4kMzVR1LW2waRJ-lHYmJuAu4&hl=be&sa=X&ei=yD5GVOuJBNjiat7jgdAO&ved=0CFgQ6AEwCA#v=onepage&q&f=false |language=ru |location=Moscow |publisher=ОЛМА Медиа Групп |isbn=5224046769 |accessdate=October 22, 2014 }}</ref><ref>{{cite web |url=http://svoim.info/201118/?18_7_1 |script-title=ru:Достоин ли А. Сахаров почестей?|trans-title=Whether A. Sakharov is worth ceremonial? |last1=Крюков |first1=С.Г. |website=Своими именами |language=Russian|accessdate=October 31, 2014}}</ref> On 28 June 1941, he participated in the battle of [[Karelian Isthmus]]. Later, he fought in [[Volkhov Front]].<ref name="Grand piano" /> In March 1942 he was ordered to leave the army<ref name="obituary" /> and join evacuated Radium Institute scientists in Kazan.
+Petrzhak served in the military intelligence company of a [[Close-in weapon system|CIWS]] regiment first as a junior lieutenant,{{sfn |РФЯЦ-ВНИИЭФ|2000|p=426}} and later as a senior lieutenant.<ref>{{cite book |last=Зенькович |first=Николай |date=2004 |script-title=ru:Тайны ушедшего века. Власть. Распри. Подоплека |trans-title=Mysteries of the passing century. Power. Arguments. Causes. |url=https://books.google.com/books?id=3oVYMfHhrnEC&pg=PA204&lpg=PA204&dq=%D0%9F%D0%B5%D1%82%D1%80%D0%B6%D0%B0%D0%BA+%D0%91%D0%BE%D0%BC%D0%B1%D0%B0&source=bl&ots=RDQWEMt0tj&sig=tDe4kMzVR1LW2waRJ-lHYmJuAu4&hl=be&sa=X&ei=yD5GVOuJBNjiat7jgdAO&ved=0CFgQ6AEwCA#v=onepage&q&f=false |language=ru |location=Moscow |publisher=ОЛМА Медиа Групп |isbn=5224046769 |accessdate=October 22, 2014 }}</ref><ref>{{cite web |url=http://svoim.info/201118/?18_7_1 |script-title=ru:Достоин ли А. Сахаров почестей?|trans-title=Whether A. Sakharov is worth ceremonial? |last1=Крюков |first1=С.Г. |website=Своими именами |language=Russian|accessdate=October 31, 2014}}</ref> On 28 June 1941, he participated in the battle of [[Karelian Isthmus]]. Later, he fought in [[Volkhov Front]].<ref name="Grand piano" /> In March 1942 he was ordered to leave the army<ref name="obituary" /> and join evacuated Radium Institute scientists in Kazan.
 In 1943, Petrzhak studied neutron induced fission of uranium under the supervision of professor [[Piotr Lukirski]]. In 1944, Petrzhak proposed a method to determine the number of neutrons present during a nuclear reaction, based on the number of protons. He also participated in the development of technology to extract plutonium from irradiated uranium blocks. Jointly with  [[M. Yakunin]], Petrzhak developed methods for the radiochemical determination of plutonium, and found the mean free path of Pu-239 alpha particles. Petrzhak founded a laboratory of neutron physics and [[nuclear fission]] at the Khlopin Radium Institute in 1947. He was the head of this laboratory until 1986,<ref name="rus-eng" /> when he became a part-time contractor.
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 Konstantin Petrzhak created an express method to detect plutonium and associated radioisotopes in samples of irradiated uranium.<ref name="rus-eng" /> From 1963 to 1976, he published a series of articles on the measurement of photofission.<ref>{{Cite journal|first1= M. Ya. |last1=Kondrat'ko |first2=V. N. |last2=Korinets |first3=K. A. |last3=Petrzhak|title=Dependence of asymmetry in the photofission of <sup>233</sup>U and <sup>239</sup>Pu on the maximum bremsstrahlung|journal=Soviet Atomic Energy|year=1976|volume=40|issue=1|pages=83–84|doi=10.1007/BF01119404}}</ref><ref>{{Cite journal|script-title=ru:Запаздывающие нейтроны при фотоделении|trans-title=Delayed neutrons during photofission|authors=Петржак, К.А.; Кондратько, М.Я.; Никотин, О.П.; Теплых, В.Ф. |language=Russian |year=1963|volume=15|pages=157–158}}</ref> From 1973 through 1984, he took part in measuring induced fission cross-sections of U-238, U-235 and Pu-239 when irradiated by monoenergy neutrons<ref>{{Cite book|last1=Алхазов |first1=И.Д. |last2=Касаткин |first2=В.П |last3=Косточкин |first3= О.И.|last4=Малкин |first4=Л.З. |last5=Сорокина |first5=A.B. |last6=Петржак |first6=К.А. |last7=Фомичёв |first7=A.B. |last8=Шпаков |first8=В.И. |last9=Румянцев |first9=Б.В.; Соколов A.M.|chapter=Измерение сечения деления 238U нейтронами с энергией 14,6 МэВ|trans-chapter=Measurements of cross-sections of U-238 fission when irradiated with neutrons of energy 14.5 MeV|script-title=ru:Нейтронная физика, Материалы II Всесоюзной конференции по нейтронной физике, Киев, 1973|trans-title=Neutron physics, proceedings of II USSR conference on neutron physics, Kiev, 1973 |language=Russian |place=Обнинск|year=1974|volume=4|pages=13–17}}</ref><ref>{{cite journal|last1=Dushin|first1=V. N.|last2=Fomichev|first2=A. V. |last3=Kovalenko |first3=S. S. |last4=Petrzhak |first4=K. A. |last5=Shpakov |first5=V. I. |last6=Arl't |first6=R. |last7=Iosh |first7=M. |last8=Muziol'|first8=G.; Ortlepp, Kh.-G.; Vagner, V.|title=Statistical analysis of experimental data on the cross sections of <sup>233, 235, 238</sup>U, <sup>237</sup>Np, <sup>239,242</sup>Pu fission by neutrons of energy 2.6, 8.5, and 14.5 MeV|journal=Soviet Atomic Energy|year=1983|volume=55|issue=4|pages=656–660|doi=10.1007/BF01124127}}</ref> In 1978, Konstantin Petrzhak co-authored a paper (with [[Yuri Oganessian]] and others) about synthesis of [[hassium]] performed in [[Joint Institute for Nuclear Research]].<ref>{{Cite web|url=http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/13/643/13643968.pdf|last2=Тер-Акопьян|first2=Г.М.|language=Russian|script-title=ru:Опыты по синтезу 108 элемента в реакции <sup>226</sup>Ra + <sup>48</sup>Ca|trans-title=Experiments on synthesis of 108th element in reaction <sup>226</sup>Ra + <sup>48</sup>Ca|last3=Плеве|first3=А.А.|last4=Чепигин|first4=В.И.|last5=Орлова|first5=О.А.|last6=Зайдель|first6=В.|last7=Селицкий|first7=Ю.А.|last8=Фунштейн|first8=В.Б.|last9=Брухертзайфер|first9=Х.; Константинеску, О.; Шварценберг, М.; Гаврилов, К.А.; Коваленко, С.С.; Петржак, К.А.|last1=Оганесян|first1=Ю.Ц.|author-link1=Yuri Oganessian}}</ref>
-Petrzhak was [[doktor nauk]] (since 1948) and a [[professor]]. He was never elected an academician or the corresponding member of any academy, but Petrzhak was a member of Nuclear Physics Department of Russian Academy of Sciences.<ref>{{cite web|url=http://www.ruhep.ru/npd/member.npd/member_e.htm|title=Members of Nuclear Physics Division of Physical Sciences Department of Russian Academy of Sciences|publisher=High Energy and Nuclear Physics in Russia}}</ref> According to [[SCOPUS]], Konstantin Petrzhak has 59 publications with [[Hirsch index]] 6.<ref>[http://www.scopus.com/authid/detail.uri?authorId=6603028607 K. A. Petrzhak] SCOPUS</ref> Konstantin Petrzhak published articles on fission products from nuclear reactors<ref>{{cite journal|title=Range of products with A=131–136 in the reactor neutron fission of <sup>237</sup>Np, <sup>243</sup>Am by and thermal neutron fission of <sup>233</sup>U, <sup>235</sup>U, and <sup>239</sup>Pu|journal=Atomic Energy|year=1998|volume=84|issue=4|pages=292–294|last1=Teplykh |first1=V. F. |author-link1= |last2=Platygina |first2=E. V. |last3=Petrzhak |first3=K. A.|doi=10.1007/BF02415238}}</ref>  until his death in 1998. He died on October 10, 1998 and was buried in Saint Petersburg.
+Petrzhak was [[doktor nauk]] (since 1948) and a [[professor]]. He was never elected an academician or the corresponding member of any academy, but Petrzhak was a member of Nuclear Physics Department of Russian Academy of Sciences.<ref>{{cite web|url=http://www.ruhep.ru/npd/member.npd/member_e.htm|title=Members of Nuclear Physics Division of Physical Sciences Department of Russian Academy of Sciences|publisher=High Energy and Nuclear Physics in Russia}}</ref> According to [[SCOPUS]], Konstantin Petrzhak has 59 publications with [[Hirsch index]] 6.<ref>[https://www.scopus.com/authid/detail.uri?authorId=6603028607 K. A. Petrzhak] SCOPUS</ref> Konstantin Petrzhak published articles on fission products from nuclear reactors<ref>{{cite journal|title=Range of products with A=131–136 in the reactor neutron fission of <sup>237</sup>Np, <sup>243</sup>Am by and thermal neutron fission of <sup>233</sup>U, <sup>235</sup>U, and <sup>239</sup>Pu|journal=Atomic Energy|year=1998|volume=84|issue=4|pages=292–294|last1=Teplykh |first1=V. F. |author-link1= |last2=Platygina |first2=E. V. |last3=Petrzhak |first3=K. A.|doi=10.1007/BF02415238}}</ref>  until his death in 1998. He died on October 10, 1998 and was buried in Saint Petersburg.
 == Personal life ==