基于高纯锗探测器的核电厂一回路系统辐射源项就地γ谱测量

辐射防护 ›› 2015, Vol. 35 ›› Issue (5): 257-261.

基于高纯锗探测器的核电厂一回路系统辐射源项就地γ谱测量

刘立业¹, 曹勤剑^1,2, 熊万春¹, 肖运实¹, 赵原¹, 卫晓峰¹, 夏三强¹

1.中国辐射防护研究院, 太原 030006;
2.中国原子能科学研究院,北京 102413

收稿日期:2014-08-26 出版日期:2015-09-20 发布日期:2024-10-22
作者简介:刘立业(1978—),男,2010年毕业于清华大学工程物理系,获博士学位,研究员。E-mail:liuliye@cirp.org.cn

In-situ gamma-spectrometry measurement of radiological source term for primary system of NPPs based on HPGe detector

Liu Liye¹, Cao Qinjian^1,2, Xiong Wanchun¹, Xiao Yunshi¹, Zhao Yuan¹, Wei Xiaofeng¹, Xia Sanqiang¹

1. China Institute for Radiation Protection,Taiyuan 030006;
2. China Institute of Atomic Energy,Beijing 102413

Received:2014-08-26 Online:2015-09-20 Published:2024-10-22

摘要/Abstract

摘要： 针对核电厂一回路系统管道内壁沉积的腐蚀活化产物,开展γ辐射源项就地测量技术研究。基于高纯锗探测器开发了辐射源项就地测量系统(Sterm-HPGe),利用蒙特卡罗软件进行了无源效率刻度,并开展了实验室效率验证工作。在300～1 408 keV能量范围内,HPGe探测器在无准直器屏蔽和有准直器屏蔽情况下,点源全能峰效率计算值与测量值的相对偏差分别在±5%和±10%以内。测量系统在我国压水堆核电厂进行了现场应用,能够较准确地测量出管道内⁶⁰Co、⁵⁸Co、^110mAg等典型沉积核素的源项活度,管道表面剂量率的计算值与测量值的相对偏差一般在±40%以内。

关键词: 源项调查, 腐蚀活化产物, 就地γ谱, 高纯锗探测器

Abstract: The technology of in-situ gamma-spectrometry source term measurement for primary system of NPPs was introduced in the paper. The measurement system was developed based on HPGe detector. Numerical efficiency calibration technique was developed based on the Mnote Carlo method. The comparisons between numerical calibration and point source experiments showed that relative deviations were within ±5% and ±10% in the energy of 300—1 408 keV for the HPGe detector without and with collimator, respectively. The measurement system had been applied for the activated corrosion source term measurement campaigns during the outage of PWR-NPPs in China. The on-site measurement results showed that it could perform a good measurement accuracy for typical radionuclides, such as ⁶⁰Co, ⁵⁸Co, ^110mAg, etc., which were the major contributors to radiation field. The relative deviations of the contacted dose rate between calculation and measurement value were mostly within ±40%.

Key words: radiological characterization, activated corrosion product, in-situ gamma spectrometry, HPGe detector

中图分类号:

R144.1

刘立业, 曹勤剑, 熊万春, 肖运实, 赵原, 卫晓峰, 夏三强. 基于高纯锗探测器的核电厂一回路系统辐射源项就地γ谱测量[J]. 辐射防护, 2015, 35(5): 257-261.

Liu Liye, Cao Qinjian, Xiong Wanchun, Xiao Yunshi, Zhao Yuan, Wei Xiaofeng, Xia Sanqiang. In-situ gamma-spectrometry measurement of radiological source term for primary system of NPPs based on HPGe detector[J]. RADIATION PROTECTION, 2015, 35(5): 257-261.