超低本底流气式正比计数器在样品总α/β测量中串道影响修正

辐射防护 ›› 2024, Vol. 44 ›› Issue (5): 461-468.

超低本底流气式正比计数器在样品总α/β测量中串道影响修正

胥海亮¹, 陈诚¹, 王亮¹, 朱珠², 郭旭影¹, 王茜¹, 粟琨璞¹

1.四川省辐射环境管理监测中心站,成都 611100;
2.中核集团质谱分析技术重点实验室,成都 611130

收稿日期:2023-08-14 出版日期:2024-09-20 发布日期:2024-11-05
通讯作者: 陈诚。E-mail:532721795@qq.com
作者简介:胥海亮(1988—),男,2012年本科毕业于成都理工大学核工程与核技术专业,获得电子科技大学计算机科学双学士学位,工程师。E-mail:814781393@qq.com
基金资助:
四川省生态环境保护科技项目应用基础研究类课题资助(2022HB03)。

Correction of crosstalk influence in the sample measurement of total α/β used by ultra low background flow gas proportional counter

XU Hailiang¹, CHEN Cheng¹, WANG Liang¹, ZHU Zhu², GUO Xuying¹, WANG Qian¹, SU Kunpu¹

1. Sichuan Radiation Environment Management and Monitoring Center Station,Chengdu 611100;
2. Key Laboratory of Mass Spectrometry Analysis Technology of China National Nuclear Corporation,Chengdu 611130

Received:2023-08-14 Online:2024-09-20 Published:2024-11-05

摘要/Abstract

摘要： 超低本底流气式正比计数器是样品总α/β测量的理想探测器,但本身具有较强的串道现象,影响样品测量的准确性。系统研究了流气式正比计数器在同一质量厚度、不同²⁴¹Am和⁴⁰K质量分数下α→β、β→α串道影响,建立了总α/β串道修正的二元方程,并与遮盖修正法进行对比,对自制的25组α/β模拟粉末样品进行了测量和串道修正。结果显示α→β串道影响较大,修正因子随着α计数率的变化并非恒定值;β→α串道修正因子影响较小,其平均值为0.001;遮盖修正法对模拟粉末样品中β测量结果的修正效果较差,其相对偏差绝对值介于1.4%~45.0%;二元方程修正法对模拟粉末样品中β测量结果的修正效果较好,其相对偏差绝对值介于0~5.5%。

关键词: 超低本底流气式正比计数器, 串道修正, 二元方程修正法

Abstract: The ultra-low background flow gas proportional counter is the ideal detector for total α/β sample measurement, but itself has strong crosstalk phenomenon, which affects the accuracy of sample measurement. This paper systematically studies the flow type proportional counter under the same mass thickness, different ²⁴¹Am and ⁴⁰K mass fractions α→β, β→α Cross channel influence. This paper established a binary equation for total α/β channel correction and compared it with the cover correction method and with the self-made 25 groups α/β simulate powder samples for measurement and channel correction. The results show that: The impact of α→β crosstalk is significant; The change with α counting rate is not constant; The influence of the β→α channel correction factor is relatively small, with an average value of 0.001. The accuracy of the measurement results is poor by using the cover correction method to correct the simulated powder β sample, with absolute relative deviation ranging from 1.4% to 45.0%. The binary equation correction method is used to correct the simulated powder β sample. The accuracy of the measurement results is relatively high, with an absolute value of relative deviation ranging from 0 to 5.5%.

Key words: ultra low background flow proportional counter, cross-talk, binary equation correction method

中图分类号:

TL811+.2

胥海亮, 陈诚, 王亮, 朱珠, 郭旭影, 王茜, 粟琨璞. 超低本底流气式正比计数器在样品总α/β测量中串道影响修正[J]. 辐射防护, 2024, 44(5): 461-468.

XU Hailiang, CHEN Cheng, WANG Liang, ZHU Zhu, GUO Xuying, WANG Qian, SU Kunpu. Correction of crosstalk influence in the sample measurement of total α/β used by ultra low background flow gas proportional counter[J]. RADIATION PROTECTION, 2024, 44(5): 461-468.

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