Estimation of Reference Gamma Radiation Field for Calibration of Radiation Monitors

IF 1 4区 工程技术 Q4 INSTRUMENTS & INSTRUMENTATION
MAPAN Pub Date : 2023-11-25 DOI:10.1007/s12647-023-00699-x
Sunil K. Singh, Liji Shaiju, Aashna Gupta, S. M. Tripathi, V. Sathian, Probal Chaudhury
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引用次数: 0

Abstract

Laboratories/facilities dealing with ionizing radiation encounter radiation field which are measured using suitable gamma radiation monitors, for area and personal monitoring. These radiation monitors are subjected to periodic calibrations to confirm that they are still fit for the purpose. In India, periodic calibration of these radiation monitors is carried out by NABL accredited calibration laboratories using source exposure devices containing radionuclide sources of 137Cs and/or 60Co. Calibration laboratories get the output from these source exposure devices standardized by RSSD, BARC, Mumbai. RSSD, BARC, provides a report on the measured output, in the form of air kerma rates at different distances, which is traceable to relevant national standards. The laboratory then uses the standardized radiation field in day-to-day calibration, by taking air kerma rate mostly at distance of 100 cm (fixed distance) as reference for estimating radiation fields at other distances by using inverse square law. The air kerma rate values obtained by the using inverse square law shows deviation from the measured values with an allowed deviation up to 5%. The impact of this deviation cannot be corrected thus is accounted in the form of uncertainty. This paper presents an average air kerma strength-based methodology which provides a simple and effective mechanism for estimating the conventional true value of air kerma rate at various distance which adds lower uncertainty to overall uncertainty, as compared to the method of using a fixed or reference distance (say 100 cm) based air kerma rate.

Abstract Image

辐射监测仪校准中参考辐射场的估计
处理电离辐射的实验室/设施会遇到辐射场,使用合适的伽马辐射监测仪进行区域和个人监测。这些辐射监测仪定期进行校准,以确认它们仍然适合使用。在印度,这些辐射监测仪的定期校准是由NABL认可的校准实验室使用含有137Cs和/或60Co放射性核素源的源照射装置进行的。校准实验室获得由RSSD, BARC,孟买标准化的这些源暴露设备的输出。RSSD, BARC提供测量输出的报告,以不同距离的空气速率形式,可追溯到相关的国家标准。然后,实验室在日常校准中使用标准化辐射场,主要以100厘米(固定距离)的空气kerma率作为参考,利用平方反比定律估算其他距离的辐射场。利用平方反比定律得到的空气速率值显示出与实测值的偏差,允许偏差达5%。这种偏差的影响无法纠正,因此以不确定性的形式计算。本文提出了一种基于平均空气kerma强度的方法,该方法提供了一种简单有效的机制来估计不同距离下空气kerma速率的常规真实值,与使用固定或参考距离(例如100厘米)的方法相比,该方法在总体不确定性中增加了更低的不确定性。
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来源期刊
MAPAN
MAPAN 工程技术-物理:应用
CiteScore
2.30
自引率
20.00%
发文量
91
审稿时长
3 months
期刊介绍: MAPAN-Journal Metrology Society of India is a quarterly publication. It is exclusively devoted to Metrology (Scientific, Industrial or Legal). It has been fulfilling an important need of Metrologists and particularly of quality practitioners by publishing exclusive articles on scientific, industrial and legal metrology. The journal publishes research communication or technical articles of current interest in measurement science; original work, tutorial or survey papers in any metrology related area; reviews and analytical studies in metrology; case studies on reliability, uncertainty in measurements; and reports and results of intercomparison and proficiency testing.
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