Iodine-125: Difference between revisions
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'''Iodine-125''' (<sup>125</sup>I) is a [[radioisotope]] of [[iodine]] which has uses in [[biological assay]]s and in [[radiation therapy]] to treat [[prostate cancer]] and [[brain tumor]]s. Its [[half-life]] is around 60 days and it emits [[gamma-ray]]s with maximum [[energies]] of 35 [[Electronvolt|keV]], some of which are internally converted to [[x-rays]]. <sup>125</sup>I is created by the [[electron capture]] decay of [[Xenon-125|<sup>125</sup>Xe]], which is a synthetic isotope of [[Xenon]], itself created by [[neutron capture]] of the slightly radioactive [[Xenon-124|<sup>124</sup>Xe]], which occurs naturally with an abundance of around 0.1%. Because of the synthetic production route of <sup>125</sup>I and its short half-life, the natural abundance is effectively 0%. |
'''Iodine-125''' (<sup>125</sup>I) is a [[radioisotope]] of [[iodine]] which has uses in [[biological assay]]s and in [[radiation therapy]] to treat [[prostate cancer]] and [[brain tumor]]s. Its [[half-life]] is around 60 days and it emits [[gamma-ray]]s with maximum [[energies]] of 35 [[Electronvolt|keV]], some of which are internally converted to [[x-rays]]. <sup>125</sup>I is created by the [[electron capture]] decay of [[Xenon-125|<sup>125</sup>Xe]], which is a synthetic isotope of [[Xenon]], itself created by [[neutron capture]] of the slightly radioactive [[Xenon-124|<sup>124</sup>Xe]], which occurs naturally with an abundance of around 0.1%. Because of the synthetic production route of <sup>125</sup>I and its short half-life, the natural abundance is effectively 0%. |
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I-125 is used in treatment of thyroid cancer. |
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==Physical Data== |
==Physical Data== |
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Revision as of 00:27, 26 April 2008
Iodine-125 (125I) is a radioisotope of iodine which has uses in biological assays and in radiation therapy to treat prostate cancer and brain tumors. Its half-life is around 60 days and it emits gamma-rays with maximum energies of 35 keV, some of which are internally converted to x-rays. 125I is created by the electron capture decay of 125Xe, which is a synthetic isotope of Xenon, itself created by neutron capture of the slightly radioactive 124Xe, which occurs naturally with an abundance of around 0.1%. Because of the synthetic production route of 125I and its short half-life, the natural abundance is effectively 0%.
I-125 is used in treatment of thyroid cancer.
Physical Data
- Element: Iodine
- Z: 54
- A: 125
- Atomic Mass:
- Density:
- Physical state: Solid at room temperature
- Isotopic abundance: 0%
- Radioactive: Yes
- T(1/2): 59.4 days
- Decay: Electron capture to 125Te
- Emissions: Gamma-rays at 35.5 keV. 7% emitted, 93% internally converted to:
- 27.0 keV (113% abundance relative to 7% gamm emission)
- 31.0 keV (26%)
- 27-32 keV (14%)
- Half-value layer: 0.025 mm Pb
References
- Harper, P.V. ; Siemens, W.D. ; Lathrop, K.A. ; Brizel, H.E. ; Harrison, R.W. Iodine-125. Proc. Japan Conf. Radioisotopes; Vol: 4th Jan 01, 1961
- ORCBS
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