Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 69(3): 117-120 (2020)


液体シンチレーション計数における鉛遮蔽体からの二次放射線の影響Effect of Secondary Radiation from Lead Shielding During Liquid Scintillation Counting

産業技術総合研究所National Metrology Institute of Japan

受付日:2019年6月26日Received: June 26, 2019
受理日:2019年11月25日Accepted: November 25, 2019
発行日:2020年3月15日Published: March 15, 2020


In this study, the effects of secondary radiation from the lead shielding on the efficiency calculation were estimated, using the MICELLE2 program and the EGS5MPI Monte Carlo code. The results show that the counting efficiency values for 54Mn (which decays via electron capture and emits gamma rays) were increased by approximately 0.5% due to the effect of the lead shield. Thus, secondary radiation was found to be non-negligible during the standardization of this radionuclide, leading to an standard uncertainty in the range of 0.6–1.2%. Henceforth, secondary radiation should be taken into account during the standardization of nuclides that decay by electron capture and emit gamma rays when using liquid scintillation counters.

Key words: liquid scintillation counter; lead shield; MICELLE2; EGS5MPI; standardization

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