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Efficiency calibration of Ge detector for $$^{131}$$I and $$^{134}$$Cs in soil samples and a simplified calculation of cascade summing corrections for volume source

Asai, Masato ; Kaneya, Yusuke*; Sato, Tetsuya  ; Tsukada, Kazuaki ; Oe, Kazuhiro; Sato, Nozomi; Toyoshima, Atsushi

To measure radioactivities in soil contaminated by the accident of the Fukushima Daiichi Nuclear Power Plant, efficiency calibration of Ge detectors for $$^{131}$$I, $$^{134}$$Cs, and $$^{137}$$Cs in volume sources was investigated. $$gamma$$-ray detection efficiencies for these nuclei were determined precisely using standard soil samples containing $$^{134}$$Cs, $$^{137}$$Cs, $$^{175}$$Hf, and $$^{88}$$Zr. These standard sources were prepared by admixing radioactive solutions with soil, and point sources were made from the same solutions to determine their radioactivity concentrations. Cascade summing corrections for $$gamma$$ rays of $$^{134}$$Cs in soil samples were evaluated experimentally. To easily calculate the cascade summing corrections for volume sources, we examined a simplified method using averaged efficiencies, and evaluated its validity through a comparison of the calculated correction factors with the experimental ones.



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