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Development of true coincidence summing correction for cascade $$gamma$$-ray emitters including $$^{134}$$Cs, 2; Study of the coincidence summing effect taking into account for the thickness of the cylindrical shaped volume sample

Yamada, Takashi*; Abe, Takaaki*; Asai, Masato  ; Yonezawa, Chushiro*; Kakita, Kazutoshi*; Hirai, Shoji*

The true coincidence summing corrections for cascade $$gamma$$ rays are usually carried out by using $$gamma$$-ray detection efficiencies averaged over whole sample volume. This is not an exact method, but is recognized to be practically useful. However, a recent international comparison experiment suggested that this method provides slightly small correction factors. To solve this problem, we developed a method to calculate the true coincidence summing corrections for cylindrical shaped volume samples by dividing the volume sample into a number of plane samples, calculating the efficiencies for each plane sample with summing corrections, and integrating them over whole sample volume. This method improved the problem of small correction factors.

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