β外推电离室的研制及性能测试

• 作 者: 方健伟 陈慧莉 袁良承 张延生
• 机 构: 核工业部辐射防护研究所,核工业部辐射防护研究所rrrrrrrrn,核工业部辐射防护研究所rrrrrrrrn,核工业部辐射防护研究所 浙江省广播电视大学杭州分校
• 出 处: 辐射防护
• 发表日期: 1988年06期
• 关键词: 电离室 外推 性能测试 记忆效应 收集极 β剂量 极间距 剂量率分布 不平行度 吸收剂量

本文介绍一台测量组织中β吸收剂量的外推电离室装置及对其主要性能的检测结果。外推电离室的收集极直径为29.85mm,极间距可变范围0.15—10.00mm,极间不平行度小于0.005mm;在 剂量率为25Gy/h的β辐射场中受照半小时以后,由辐射产生的记忆效应的消失时间约为48h。可测定的剂量率范围为1.27_×10~(-3)—2.37×10Gy/h,测量结果的系统相对误差小于4％,随机不确定度小于1％(1 σ)。对天然铀块的表面剂量率进行了测量。

This article describes an extrapolation ionization chamber device that measures beta-absorbent dose in tissue and results of its main properties. Extrapolation ionization chamber collector diameter of 29.85mm, variable pitch range of 0.15-10.00mm, non-parallel between the poles is less than 0.005mm; dose rate of 25Gy / h in the beta radiation half an hour after exposure by The memory effect disappeared by radiation for about 48h. The measurable dose rate ranged from 1.27 × 10 -3 to -2.37 × 10 Gy / h. The relative error of the measurement results was less than 4% and the random uncertainty was less than 1% (1 σ). The surface dose rate of natural uranium blocks was measured.