CT电离室校准条件的建立与模拟

doi:10.3969/j.issn.1000-1158.2016.06.24

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摘要根据IAEA TRS 457报告提出的CT电离室校准方法,建立了RQT 8辐射质,运用蒙特卡罗模拟程序EGSnrc得到RQT 8辐射质下距源焦点95cm处,射野半径为5cm的平面上的注量谱及角分布,以此构造校准模型,并研究了附加光阑的长度、倒角对校准CT电离室的影响。建立的参考辐射质半值层偏差为1.4%,附加光阑在长度为50mm倒角为80°时散（透）射最小,总体达到了CT电离室校准、测试和国际比对的要求。

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	廖振宇
	吴金杰
	屈国普
	王佳
	葛双
	霍彬彬
	杨扬

关键词 ：计量学, CT电离室, 校准条件, 参考辐射质, 附加光阑, 蒙特卡罗模拟

Abstract：Based on the calibration method in the IAEA TRS 457 report, RQT 8 radiation quality was established. The spectra and angular distributions for RQT 8 radiation quality was performed by Monte Carlo simulation software EGSnrc with the distance of 95 cm, radius of 5 cm between tube focal spot and recording planar, which constructing the model of CT chambers calibration field. The effection of calibration CT chambers was studied under additional aperture with different length as well as angle edges. The result shows that the deviation of established Half-value Layer for reference radiation quality no more than 1.4%, the scattering and transmission is the least when the width of additional apertures is 50mm and the opening angle is 80°, all of which is reaching on the requirements of calibration, testing and international comparison for CT chambers.

Key words： metrology CT chamber calibration condition reference radiation quality additional apertures Monte Carlo simulation

收稿日期: 2016-03-15 发布日期: 2016-10-14

PACS:

TB98

通讯作者: 屈国普 E-mail: quguopu@usc.edu.cn

作者简介: 廖振宇（1991-）,男,湖南衡阳人,南华大学核科学技术学院硕士研究生,主要研究方向为电离辐射剂量学。282493099@qq.com

引用本文:

廖振宇,吴金杰,屈国普,王佳,葛双,霍彬彬,杨扬. CT电离室校准条件的建立与模拟[J]. 计量学报, 2016, 37(6): 663-666.
LIAO Zhen-yu,WU Jin-jie,QU Guo-pu,WANG Jia,GE Shuang,HUO Bin-bin,YANG Yang. Establishment and Simulation of Calibration Conditions for CT Chamber. Acta Metrologica Sinica, 2016, 37(6): 663-666.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2016.06.24 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2016/V37/I6/663