三台辐射防护仪测量结果的比较与分析  

Comparison and analysis of measurement results of three kinds of radiation protection survey meters

作　　者：周艳[1] 梁挺[2] 陈发想 董颖[2] ZHOU Yan;LIANG Ting;CHEN Fa-xiang(Guangxi Zhuang Autonomous Region Occupational Disease Prevention and Research Institute,Nanning 530021,China)

机构地区：[1]广西壮族自治区职业病防治研究院,广西南宁530021 [2]广西壮族自治区疾病预防控制中心放卫所,广西南宁530021

出　　处：《中国医学装备》2018年第6期29-32,共4页China Medical Equipment

基　　金：广西壮族自治区卫生和计划生育委员会科技研究计划课题(Z2015453)"广西火车站安检系统放射危害评价与控制技术研究"

摘　　要：目的:探讨使用辐射防护仪进行测量时响应时间和时间因子对测量结果的影响,评价3台辐射防护仪测量结果的差异。方法:在直接数字化X射线摄影系统(DR)的不同出束时间下,对不同3台辐射防护仪的剂量率读数进行比较,分析经时间因子修正前、后测量结果的差异。结果:在DR的出束时间小于辐射防护仪的响应时间时,经时间因子修正前、后的剂量率读数有显著性差异;相同的出束时间下,响应时间一致的两种辐射防护仪的剂量率读数差异无统计学意义(F=0.406,P>0.05);响应时间不同的两种辐射防护仪剂量率读数差异有统计学意义(F=7.214,F=5.368;P<0.05)。结论:在辐射测量中,当被测量设备的出束时间小于辐射防护仪的响应时间时,必须使用时间因子对剂量率读数进行修正;在辐射测量中必须合理选用防护仪,必要时须对响应时间不同的辐射防护仪的剂量率读数进行仪器修正。Objective： To explore the effects of response time and time factor on the measurement results in using radiation protection survey meters to carry out measurement, and to evaluate the difference of measurement results among different radiation protection survey meters. Methods： Through compared the dose-rate readings of different radiation protection survey meters under different bundle time of direct digital radiography（DR） system to analyze the differences of measurement results before and after the correction of time factor. Results： When the bundle time of DR was less than the response time, there was significant difference in the dose rate reading between before and after the correction of time factor. Under the same bundle time, the difference of dose rate reading of two radiation protection survey meters with coincident response time was no significant（F=0.406, P〉0.05）, while the difference of dose rate reading of two radiation protection survey meters with different response time was significant（F=7.214, F=5.368; P〈0.05）. Conclusion： In the measurement of radiation, time factor must be used to correct dose rate reading when the bundle time is less than the response time of radiation protection survey meters. It is necessary to reasonably choose radiation protection survey meters in the measurement of radiation, and the dose rate reading of different radiation protection survey meters with different response time should be corrected in necessity.

关 键 词：辐射防护仪 剂量率读数 响应时间 时间因子 

分 类 号：R143[医药卫生—公共卫生与预防医学]