Activity determination and nuclear decay data of Cd-113m

作者：Kossert K^*; Naehle O; Warwick P E; Wershofen H; Croudace I W

来源：Applied Radiation and Isotopes, 2011, 69(2): 500-505.

DOI：10.1016/j.apradiso.2010.10.006

• Cd-113m
• Liquid scintillation counting
• TDCR
• CIEMAT/NIST
• Free parameter model

The radionuclide Cd-113m was extracted from a Cd component, which has been irradiated in a research reactor during its routine operation. A validated separation procedure was then used to obtain a Cd-113m solution of high radiochemical purity. The solution was measured by means of liquid scintillation counting for activity determination. To this end, the CIEMAT/NIST efficiency tracing method as well as the triple-to-double coincidence (TDCR) counting technique were used. Measurements in a low-background gamma-ray spectrometer were applied to identify any potential photon-emitting impurities and to measure the 263.7 keV photons from the isomer transition. A gamma emission probability of 0.01839(29)% was determined for this line. The liquid scintillation measurements were also used to evaluate the half-life of Cd-113m. The decay was followed for about 11 months and a half-life T-1/2=13.97(13) years was obtained.

• 出版日期2011-2