中华放射医学与防护杂志

罗素明,何志坚,高磊,等.后装治疗源¹⁹² Ir空气比释动能强度检测与评价[J].中华放射医学与防护杂志,2011,31(1):76-78.LUO Su-ming,HE Zhi-jian,GAO Lei,et al.Evaluation and test of ¹⁹²Ir air kerma strength for afterloading systems[J].Chin J Radiol Med Prot,2011,31(1):76-78

后装治疗源¹⁹² Ir空气比释动能强度检测与评价

Evaluation and test of ¹⁹²Ir air kerma strength for afterloading systems

投稿时间：2010-01-06

DOI：10.3760/cma.j.issn.0254-5098.2011.01.022

中文关键词: 井型电离室后装 ¹⁹²Ir源

英文关键词:Well type chamber Afterloading ¹⁹²Ir source

基金项目:科技部科研院所社会公益研究专项(2004DIB1J035)

作者	单位
罗素明	100088 北京,中国疾病预防控制中心辐射防护与核安全医学所
何志坚	100088 北京,中国疾病预防控制中心辐射防护与核安全医学所
高磊	100088 北京,中国疾病预防控制中心辐射防护与核安全医学所
岳保荣	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:

目的研究用井型电离室测量后装¹⁹²Ir源空气比释动能强度的方法。方法用CDX-2000A静电计和HDR 1000 井型电离室,现场检测30台后装¹⁹²Ir源空气比释动能强度,根据源外观活度与空气比释动能强度转换系数,计算源外观活度。用实测源活度与厂家给出的初始源活度比较,相对偏差应在±5%内符合要求。结果对所有检测的30台后装¹⁹²Ir源活度与厂家初始源活度比较,相对偏差在-0.1%~4.4%范围内。结论井型电离室测量法简便,准确度高,在医院可用于质量控制检测。

英文摘要:

Objective To study the method of measuring air kerma strength of afterloading units with ¹⁹²Ir source by using well type ionization chamber. Methods The air kerma strength of 30 afterloading units with ¹⁹²Ir source was measured using 2000A electrometer and 1000 plus well type ionization chamber,and apparent activity of the source was calculated with the air kerma strength and apparent activity conversion factor. The measured activity of the source was compared with the original value of the source provided by the manufacturer, and the relevant deviation should be within ±5%. Results Theair kerma strength of afterloding units with ¹⁹²Ir sources was tested. The relevant deviation of the measured activity and the original value was within -0.1%-4.4%. Conclusions The measurement method with a well type ionization chamber is convenient and highly accurate which can be used for the test of quality control in hospitals.

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