Isotopes of radon

From Wikipedia, the free encyclopedia
  (Redirected from Radon-220)
Jump to navigation Jump to search
Main isotopes of radon (86Rn)
Iso­tope Decay
abun­dance half-life (t1/2) mode pro­duct
210Rn syn 2.4 h α 206Po
211Rn syn 14.6 h ε 211At
α 207Po
222Rn trace 3.8235 d α 218Po
224Rn syn 1.8 h β 224Fr

There are 37 known isotopes of radon (86Rn) from 195Rn to 231Rn; all are radioactive. The most stable isotope is 222Rn with a half-life of 3.823 days, which decays into 218
Po
. Five isotopes of radon, 217, 218, 219, 220, 222Rn occur in trace quantities in nature as decay products of, respectively, 217At, 218At, 223Ra, 224Ra, and 226Ra. 217Rn is produced in a rare branch in the decay chain of trace quantities of 237Np, 218Rn and 222Rn are intermediate steps in the decay chain for 238U, with 219Rn an intermediate step in the decay chain for 235U, and 220Rn occurring in the decay chain for 232Th.

List of isotopes[edit]

Nuclide
[n 1]
Historic
name
Z N Isotopic mass (u)
[n 2][n 3]
Half-life
Decay
mode

Daughter
isotope

Spin and
parity
[n 4][n 5]
Isotopic
abundance
Excitation energy[n 5]
195Rn 86 109 195.00544(5) 6 ms 3/2−#
195mRn 50(50) keV 6 ms 13/2+#
196Rn 86 110 196.002115(16) 4.7(11) ms
[4.4(+13−9) ms]
α 192Po 0+
β+ (rare) 196At
197Rn 86 111 197.00158(7) 66(16) ms
[65(+23−14) ms]
α 193Po 3/2−#
β+ (rare) 197At
197mRn 200(60)# keV 21(5) ms
[19(+8−4) ms]
α 193Po (13/2+)
β+ (rare) 197At
198Rn 86 112 197.998679(14) 65(3) ms α (99%) 194Po 0+
β+ (1%) 198At
199Rn 86 113 198.99837(7) 620(30) ms α (94%) 195Po 3/2−#
β+ (6%) 199At
199mRn 180(70) keV 320(20) ms α (97%) 195Po 13/2+#
β+ (3%) 199At
200Rn 86 114 199.995699(14) 0.96(3) s α (98%) 196Po 0+
β+ (2%) 200At
201Rn 86 115 200.99563(8) 7.0(4) s α (80%) 197Po (3/2−)
β+ (20%) 201At
201mRn 280(90)# keV 3.8(1) s α (90%) 197Po (13/2+)
β+ (10%) 201At
IT (<1%) 201Rn
202Rn 86 116 201.993263(19) 9.94(18) s α (85%) 198Po 0+
β+ (15%) 202At
203Rn 86 117 202.993387(25) 44.2(16) s α (66%) 199Po (3/2−)
β+ (34%) 203At
203mRn 363(4) keV 26.7(5) s α (80%) 199Po 13/2(+)
β+ (20%) 203At
204Rn 86 118 203.991429(16) 1.17(18) min α (73%) 200Po 0+
β+ (27%) 204At
205Rn 86 119 204.99172(5) 170(4) s β+ (77%) 205At 5/2−
α (23%) 201Po
206Rn 86 120 205.990214(16) 5.67(17) min α (62%) 202Po 0+
β+ (38%) 206At
207Rn 86 121 206.990734(28) 9.25(17) min β+ (79%) 207At 5/2−
α (21%) 203Po
207mRn 899.0(10) keV 181(18) µs (13/2+)
208Rn 86 122 207.989642(12) 24.35(14) min α (62%) 204Po 0+
β+ (38%) 208At
209Rn 86 123 208.990415(21) 28.5(10) min β+ (83%) 209At 5/2−
α (17%) 205Po
209m1Rn 1173.98(13) keV 13.4(13) µs 13/2+
209m2Rn 3636.78(23) keV 3.0(3) µs (35/2+)
210Rn 86 124 209.989696(9) 2.4(1) h α (96%) 206Po 0+
β+ (4%) 210At
210m1Rn 1690(15) keV 644(40) ns 8+#
210m2Rn 3837(15) keV 1.06(5) µs (17)−
210m3Rn 6493(15) keV 1.04(7) µs (22)+
211Rn 86 125 210.990601(7) 14.6(2) h α (72.6%) 207Po 1/2−
β+ (27.4%) 211At
212Rn 86 126 211.990704(3) 23.9(12) min α 208Po 0+
β+β+ (rare) 212Po
213Rn 86 127 212.993883(6) 19.5(1) ms α 209Po (9/2+)
214Rn 86 128 213.995363(10) 0.27(2) µs α 210Po 0+
β+β+ (rare) 214Po
214mRn 4595.4 keV 245(30) ns (22+)
215Rn 86 129 214.998745(8) 2.30(10) µs α 211Po 9/2+
216Rn 86 130 216.000274(8) 45(5) µs α 212Po 0+
217Rn 86 131 217.003928(5) 0.54(5) ms α 213Po 9/2+ Trace[n 6]
218Rn 86 132 218.0056013(25) 35(5) ms α 214Po 0+ Trace[n 7]
219Rn Actinon
Actinium emanation
86 133 219.0094802(27) 3.96(1) s α 215Po 5/2+ Trace[n 8]
220Rn Thoron
Thorium emanation
86 134 220.0113940(24) 55.6(1) s α 216Po 0+ Trace[n 9]
ββ (rare) 220Ra
221Rn 86 135 221.015537(6) 25.7(5) min β (78%) 221Fr 7/2(+)
α (22%) 217Po
222Rn Radon[n 10]
Radium emanation
Emanation
Emanon
Niton
86 136 222.0175777(25) 3.8235(3) d α 218Po 0+ Trace[n 7]
223Rn 86 137 223.02179(32)# 24.3(4) min β 223Fr 7/2
224Rn 86 138 224.02409(32)# 107(3) min β 224Fr 0+
225Rn 86 139 225.02844(32)# 4.66(4) min β 225Fr 7/2−
226Rn 86 140 226.03089(43)# 7.4(1) min β 226Fr 0+
227Rn 86 141 227.03541(45)# 20.8(7) s β 227Fr 5/2(+#)
228Rn 86 142 228.03799(44)# 65(2) s β 228Fr 0+
229Rn[1] 86 143 229.0426536(141) 12(1) s β 229Fr
230Rn[2] 86 144 β 230Fr 0+
231Rn[3] 86 145 β 231Fr
  1. ^ mRa – Excited nuclear isomer.
  2. ^ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. ^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
  4. ^ ( ) spin value – Indicates spin with weak assignment arguments.
  5. ^ a b # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  6. ^ Intermediate decay product of 237Np
  7. ^ a b Intermediate decay product of 238U
  8. ^ Intermediate decay product of 235U
  9. ^ Intermediate decay product of 232Th
  10. ^ Source of element's name

References[edit]

  1. ^ Neidherr, D.; Audi, G.; Beck, D.; Baum, K.; Böhm, Ch.; Breitenfeldt, M.; Cakirli, R. B.; Casten, R. F.; George, S.; Herfurth, F.; Herlert, A.; Kellerbauer, A.; Kowalska, M.; Lunney, D.; Minaya-Ramirez, E.; Naimi, S.; Noah, E.; Penescu, L.; Rosenbusch, M.; Schwarz, S.; Schweikhard, L.; Stora, T. (19 March 2009). "Discovery of 229Rn and the Structure of the Heaviest Rn and Ra Isotopes from Penning-Trap Mass Measurements" (PDF). Physical Review Letters. 102 (11): 112501–1–112501–5. Bibcode:2009PhRvL.102k2501N. doi:10.1103/PhysRevLett.102.112501. PMID 19392194.
  2. ^ [1]
  3. ^ [2]"