| Xu Jiaang,Song Gang,Li Hailiang,et al.Preliminary testing and analysis of crosstalk in gross α and gross β measurement using an MPC 9604 low background α/β counter[J].Chinese Journal of Radiological Medicine and Protection,2024,44(11):965-970 |
| Preliminary testing and analysis of crosstalk in gross α and gross β measurement using an MPC 9604 low background α/β counter |
| Received:December 05, 2023 |
| DOI：10.3760/cma.j.cn112271-20231205-00198 |
| KeyWords:MPC 9604 Gross α Gross β Crosstalk |
| FundProject: |
| Author Name | Affiliation | E-mail | | Xu Jiaang | School of Preventive Medicine Sciences (Institute of Radiation Medicine), Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 250118, China | | | Song Gang | School of Preventive Medicine Sciences (Institute of Radiation Medicine), Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 250118, China | | | Li Hailiang | School of Preventive Medicine Sciences (Institute of Radiation Medicine), Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 250118, China | | | Wu Fangfang | School of Preventive Medicine Sciences (Institute of Radiation Medicine), Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 250118, China | | | Jin Chang | School of Preventive Medicine Sciences (Institute of Radiation Medicine), Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 250118, China | | | Min Nan | School of Preventive Medicine Sciences (Institute of Radiation Medicine), Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 250118, China | | | Wang Xiaoshan | School of Preventive Medicine Sciences (Institute of Radiation Medicine), Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 250118, China | wangxiaoshan@sdfmu.edu.cn |
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| Abstract:: |
| Objective To explore the causes of the crosstalk in the gross α and gross β measurement using an MPC 9604 low background α/β counter. Methods With the A4 copy paper (70 g/m2), polyethylene (PE) films (8.7 g/m2), and 304 stainless steel seperately as shielding materials, the gross α and gross β experiments, gamma spectrometry experiments and solid state nuclear track detection (SSNTD) experiments were conducted by using 241Am and 40K standard materials. A comprehensive analysis encompassing statistical analysis and nuclear physics analysis was performed to reveal the impact of contributing factors on the crosstalk in the gross α and gross β measurement with an MPC 9604 low background α/β counter. Results 241Am powder source experimental result: when two sheets of copy paper were used in the experiment, α-rays did not generate one count in the β channel of the low background α/β counter. The same test with the shielding material of two layers of PE films showed that the α count rate further decreased by about 36.5%, while the β count rate hardly changed. The gross α and gross β experiments and γ spectrometry with the shielding material of stainless steel demonstrated that the characteristic γ ray peaking at 59.5 keV of the 241Am powder source did not generate one count in the β channel. 40K powder source experimental result: when the source was covered with steel of total thickness of 0.965 mm in the gross α and gross β experiments, the γ rays of 40K did not generate one count in the β channel. Compared with naked 40K powder source, when source was covered with one and two sheets of copy paper, the gross α count rate decreased approximately from 3.30×10-3 to 1.50×10-3 and 1.75×10-3, respectively. The SSNTD indicated the presence of other α nuclides in 40K powder source. Conclusions The β counting in the β channel with the 241Am powder source using MPC 9604 low background α/β counter was, instead of α-rays, caused by the internal conversion electrons and the characteristic X rays of 11.870-22.402 keV emitted from the 241Am powder source, thus this is not a true α/β crosstalk. The α counting in α channel with the 40K powder source, except the contribution of impurity α nuclides, was mainly attributed to the α signals arising from β particles when the amplitude of the piled-up β pules exceeded the discrimination threshold of the detector, therefore it is a true crosstalk. |
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