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Radioactivity measurement of Sr/Y-90 mixed with Cs-134 and Cs-137 using large solid angle detectors without chemical separation |
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| Authors: | Yasuhiro Unno Toshiya Sasami Masayuki Hagiwara Shinichi Sasaki Akira Yunoki |
| Affiliation: | 1. National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Ibaraki 305-8568, Japan;2. Department of Accelerator Science, The Graduate University for Advanced Studies (Sokendai), Ibaraki 305-0801, Japany.unno@aist.go.jp;4. Department of Accelerator Science, The Graduate University for Advanced Studies (Sokendai), Ibaraki 305-0801, Japan;5. High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801, Japan |
| Abstract: | We proposed a method to measure the radioactivity of Sr/Y-90 in the mixture of Cs-134 and Cs-137 without chemical pretreatment. It was realized by subtracting the electrons produced in Cs-134 and Cs-137 from entire electron emission rate that can be determined by the efficiency tracer technique in the 4πβ–γ coincidence counting method. The radioactivity of Cs-134 and Cs-137 can be determined by gamma ray spectrometry. The measurements were conducted using plastic and NaI(Tl) scintillation detector with a large solid angle. The validity of the measurement method was shown by agreement of the results with the known radioactivities. |
| Keywords: | radioactivity radionuclide mixture cesium 137 cesium 134 strontium 90, beta ray detector gamma ray detector 4πβ–γ coincidence counting direct measurement |