利用数字化仪实现α、β平面源表面粒子发射率的绝对测量  

Absolute measurement of surface particle emission rates from α and β plane sources using a digitizer

作　　者：路天翔 周倩倩 张明[2] 拓飞[1] 孔淑颖 LU Tianxiang;ZHOU Qianqian;ZHANG Ming;TUO Fei;KONG Shuying(National Institute for Radiological Protection,Chinese Center for Disease Control and Prevention,Beijing 100088 China;National Institute of Metrology,Beijing 100029 China)

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所,北京100088 [2]中国计量科学研究院,北京100029

出　　处：《中国辐射卫生》2023年第1期1-5,共5页Chinese Journal of Radiological Health

摘　　要：目的 为验证数字化仪代替传统电子学插件进行放射性核素测量的有效性和准确性。方法 基于大面积流气式多丝正比计数器2πα、2πβ表面粒子发射率测量装置,采用CAEN公司开发的DT5730型数字波形采样器对α平面源^(241)Am和不同能量的β平面源核素^(14)C、^(36)Cl和^(90)Sr-^(90)Y进行波形信号采集、幅度分析和数据处理。结果 在电子学阈值、高压等实验条件一致情况下,经死时间、本底修正后得到的α、β表面粒子发射率结果与基于插件定标器得到的测量结果偏差均在0.6%以内,在不确定度范围内相一致。结论 数字化仪可有效替代传统电子学插件实现α、β信号的采集和处理,实现α、β发射率准确测量。Objective To prove the validity and accuracy of the digitizer instead of the conventional electronics plug-in for radionuclide measurement.Methods Based on a large-area flow-gas multi-wire proportional counter for 2πα and 2πβsurface particle emission rate measurement,the DT5730 digital waveform sampler developed by CAEN was used for waveform signal acquisition,amplitude analysis,and data processing of the α-plane source 241Am and the β-plane source nuclides^(14)C,^(36)Cl,and ^(90)Sr-^(90)Y of different energies.Results The deviations between the α and β surface particle emission rate results obtained after dead time and background corrections and the measurements obtained based on the plug-in calibrator were all within 0.6%,within the uncertainty range,under consistent experimental conditions such as electronics threshold and high pressure.Conclusion The digitizer is an effective alternative to conventional electronics plug-ins for α and β signal acquisition and processing and the accurate measurement of α and β emission rates.

关 键 词：数字化仪 计量学 正比计数器 平面源 发射率 

分 类 号：TB98[一般工业技术—计量学]