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125
I是发射低能γ的同位素,衰变纲图见图1
[1]
。它通过电子俘获衰变到
125
Te的激发态(其中产生的27.5 keV
K
X射线,分支比为68.5%),然后经
γ
跃迁(发射35keV
γ
,分支比为6.4%)或发射内转换电子(也产生上述
K
X射线,分支比为66.0%)退激到基态。
A simple method for absolute assay of medical solution of
125
I is described
which takes advantage of the area in the coincident sum peak in the single crystal NaI (Tl) γ-ray spectrum. Using this method to various measurement conditions
we get accuracy within 1%.
Nucl. Data Sheets , 7 , 5 , ( 1972 ).
J. S. Eldridge et al ., Nucleonics , 22 , 6 , 56 ( 1964 ).
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