Journal of Isotopes ›› 2021, Vol. 34 ›› Issue (1): 61-65.DOI: 10.7538/tws.2021.34.01.0061

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Preparation of Standard Plane Source of 210Po

ZHU Heng;CHEN Xilin;ZHU Baoji;DIAO Lijun;YAO Shunhe;XIN Yu;GUO Xiaoqing;YAO Yanling;LYU Xiaoxia   

  1. China Institute of Atomic Energy, Beijing 102413, China
  • Online:2021-02-20 Published:2021-02-20



  1. 中国原子能科学研究院,北京102413


A method of spontaneous deposition of 210Po on a silver disc was used to prepare the standard plane source in a 210Pb solution. The prepared source was measured by an alpha spectrometer. There was a unique alpha peak of 5.304 MeV with a full width at half maximum of 23.92 keV in the measured spectrum. A plateau length of about 1000 V was given in the plateau curve measued with a multi-wire proportional counter. The determined surface emission rate was 2.565 ×104 min-1 at JAN.  3RD , 2019, with the extended uncertainty of 2.7% (k=2). Some MPC9604 gas-flow low background gross alpha and gross beta counters were used to test the source according to the verification regulation JJG 1100-2014. All the α detection efficiencies were not less than 77%, the repeatability within 1.5% and the α interference to β channel not greater than 2.5%. It’s showed that the prepared source was in good quality and performance to meet the calibration of gas-flow low background gross alpha and gross beta counters.

Key words: 210Po, spontaneous deposition, surface emission rate, energy resolution


采用自沉积法从210Po溶液中制备了210Po平面源,用α谱仪测量该平面源,测量谱中只有一个5.304 MeV α能峰,能量分辨率为23.92 keV。用2πα、2πβ表面发射率标准装置测量该平面源的坪曲线,坪区为0.8~1.8 kV,坪长为1 000 V,测定的表面发射率为2.565×104 min-1(参考日期2019年1月3日),扩展不确定度为2.7%(k=2)。按JJG 1100-2014检定规程用MPC9604型流气式低本底α、β测量仪测定该源,探测效率不低于77%,重复性在1.5%以内,α对β道串道比在2.5%以内。该方法操作简便,制备的210Po平面标准源性能满足工作需求。

关键词: 210Po, 自沉积, 表面发射率, 能量分辨率