3MeV电子辐照加速器主厅内漂移管周围辐射场分析

对漂移管周围不同方向剂量水平及其影响因素进行定量评估，有助于对电子辐照加速器主厅内辐射分布建立定性认识。由于加速管沿程束流损失和来自辐照室的透射辐射对加速器主厅的贡献极小，辐照室内经过漂移管外孔隙的散射辐射是加速器主厅的主要辐射源。本文利用蒙特卡罗程序MCNP5对某3MeV高频高压加速器机房进行建模，着重探索不同类型地板圆形通孔对加速器主厅剂量的影响程度。结果表明，通孔直径对垂直方向剂量率的影响极小，而水甲方向剂量率随直径的不同而变化明显。对于直径10cm左右的漂移管，通孔采用直径40-60cm圆孔较佳；通孔巾采用阶梯型圆台结构不仅节省了加速器轴向高度，更能有效地降低漂移管周围的辐射水平。...

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Bibliographic Details
Published in核技术 Vol. 38; no. 2; pp. 10 - 15
Main Author 雷洁瑛 陈志 李珏忻 於国兵 顾先宝 徐榭
Format Journal Article
LanguageChinese
Published 中国科学技术大学核科学技术学院 合肥230027%中国科学技术大学国家同步辐射实验室 合肥230029%安徽省辐射环境监测站 合肥230071 2015
Subjects
MCNP5
加速器主厅辐射场
屏蔽设计
通孔
MCNP5
Radiation field of machine hall
Shielding design
加速器主厅辐射场
The hole
屏蔽设计
通孔
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ISSN0253-3219
DOI10.11889/j.0253-3219.2015.hjs.38.020201

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Summary:对漂移管周围不同方向剂量水平及其影响因素进行定量评估，有助于对电子辐照加速器主厅内辐射分布建立定性认识。由于加速管沿程束流损失和来自辐照室的透射辐射对加速器主厅的贡献极小，辐照室内经过漂移管外孔隙的散射辐射是加速器主厅的主要辐射源。本文利用蒙特卡罗程序MCNP5对某3MeV高频高压加速器机房进行建模，着重探索不同类型地板圆形通孔对加速器主厅剂量的影响程度。结果表明，通孔直径对垂直方向剂量率的影响极小，而水甲方向剂量率随直径的不同而变化明显。对于直径10cm左右的漂移管，通孔采用直径40-60cm圆孔较佳；通孔巾采用阶梯型圆台结构不仅节省了加速器轴向高度，更能有效地降低漂移管周围的辐射水平。
Bibliography:Background： With the extensive application of industrial irradiation accelerator, more and more people get involved in this field. It is necessary to know the whole radiation distribution in accelerator room for the consideration of the human radiation safety. Purpose： In order to acquire qualitative knowledge for radiation distribution in machine hall, quantitatively calculation of the dose at points locating in the vertical and horizontal situation around the drift tube was carried out to achieve the distribution of radiation field and the best type of the hole when different types of holes were employed. Methods： The major source roots in the scattering radiation through the pore outside the drift tube, thus the MCNP5 was applied to the multi-step simulation of radiation field distribution on a 3-MeV Dynamitron. Results： The size and shape of hole have tiny effect on the dose rate in vertical direction; while the dose rates at different points from drift tube in the horizontal direction change with the typ
ISSN:0253-3219
DOI:10.11889/j.0253-3219.2015.hjs.38.020201