摘要
BEPCⅡ直线加速器脉冲流强大且脉宽小，束流损失造成的辐射场是一个占空因子很小、辐射水平很高的瞬发辐射场。丙氨酸／ESR作为一种大剂量辐射场探测方法，本文首先实验刻度丙氨酸剂量计，用于隧道辐射场实验测量，并结合MCNP软件模拟计算校正测量结果。结果表明，束流注入阶段，e＋靶区中子含量高，与光子通量比为3．7，光子剂量率0．94Cy／h，中子剂量率范围8．2—16．4Cx／h。其他区域（除e＋靶区），中子含量少，基本忽略中子剂量率，且因束损不均匀导致剂量水平空间差异较大，剂量率范围0．1Gy／h至十几个Gy／h，相差达两个数量级。
The character of BEPCII linear accelerator is that its beam intensity is large and pulse width is small, so beam losses cause high dosage rate within a short time. Alanine/ESR is a method of detecting this radiation. These alanine dosimeter is used after its experimental calibrations, and the MCNPX Monte Carlo software is used to Calibrate the measurements. The results show that during beam injection at e ＋ target area the number of neutron is 3.7 times of the photon and their dose rate are 8.2 - 16.4 Gy/h and 0.94 Gy/h. At other areas the neutron dose rate is ignored and the range of dose rate is from 0.1 Gy/h to more than 10Gy/h because of non - uniform beam losses.
出处
《核电子学与探测技术》
CAS
北大核心
2016年第8期880-884,共5页
Nuclear Electronics & Detection Technology
