中华放射医学与防护杂志

曹磊,邓君,王成国,等.用于油气田测井的CR39快/热中子个人剂量计的初步设计[J].中华放射医学与防护杂志,2011,31(4):489-492.CAO Lei,DENG Jun,WANG Cheng-guo,et al.Preliminary design of CR39 fast/thermal neutron personal dosimeter used in oil and gas field logging[J].Chin J Radiol Med Prot,2011,31(4):489-492

用于油气田测井的CR39快/热中子个人剂量计的初步设计

Preliminary design of CR39 fast/thermal neutron personal dosimeter used in oil and gas field logging

投稿时间：2010-06-07

DOI：10.3760/cma.j.issn.0254-5098.2011.04.031

中文关键词: 快/热中子个人剂量计外赋响应 BN前置径迹转换体

英文关键词:Fast/thermal neutron personal dosimeter Externally assigned response BN track pre-adaptor

基金项目:

作者	单位
曹磊	100088 北京,中国疾病预防控制中心辐射防护与核安全医学所
邓君	100088 北京,中国疾病预防控制中心辐射防护与核安全医学所
王成国	内蒙古自治区疾病预防控制中心
刘运宏	100088 北京,中国疾病预防控制中心辐射防护与核安全医学所
郭文	100088 北京,中国疾病预防控制中心辐射防护与核安全医学所
钱叶侃	100088 北京,中国疾病预防控制中心辐射防护与核安全医学所
孙全富	100088 北京,中国疾病预防控制中心辐射防护与核安全医学所

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中文摘要:

目的利用前置反冲层提高CR39(Columbia Resin 39)固体核径迹探测器的外赋响应,并改善CR39能量响应特性,研制适用于油气田测井职业照射现场的被动式快/热中子个人剂量监测装置。方法采用氮化硼(BN)作为CR39探测器的前置径迹转换体,利用¹⁰B(n,α)⁷Li反应产生的α粒子增加CR39探测器的径迹密度,并采用Monte Carlo模拟和标准源照射实验对新设计的探测器进行验证,研究提高CR39探测器的外赋响应性能。结果中子注量灵敏度是3.46×10^-4径迹/中子,中子剂量当量灵敏度是(7.57±0.41)×10²径迹·cm²·mSv^-1,探测线性范围是0.013~52.8 mSv。理论推导和²⁴¹Am-Be标准中子源实验结果说明,BN前置层的使用有效提高了CR39探测器的探测效率,拓展了剂量计的能量响应范围,初步实现了对热中子引起剂量贡献的定量测量。结论高灵敏度CR39快/热中子个人剂量计是一种适用于油气田测井环境、具有发展潜力的新型高灵敏度中子个人剂量计。

英文摘要:

Objective To increase externally-assigned response, improve energy response of CR39 and develop positive fast/thermal neutron personal dosimeter applicable for occupational exposure in oil and gas field logging by using pre-recoil layer. Methods The externally-assigned response of CR39 detector was improved through increasing the track density by using the α particle induced by the reaction of ¹⁰B(n,α)⁷Li with the BN as pre-recoil layer, and the increase was vilified by using both Monte-Carlo simulation and experiment exposed by standard neutron source. Results Fast/thermal neutron personal dosimeter's neutron flux sensitivity and neutron dose equivalent sensitivity were 3.46×10^-4track per neutron, (7.57±0.41)×10² track·cm²·mSv^-1, respectively. The detecting linearity range was between 0.013 and 52.8 mSv. According to theoretical derivation and experiment of standard ²⁴¹Am-Be neutron source, detecting efficiency and energy response of CR39 were effectively improved, and quantitative measurement of dose contributed by thermal neutron was realized. Conclusions CR39 fast/thermal neutron personal dosimeter of high sensitivity is applicable to oil and gas field logging environment and of potential development.

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