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Standardisation of 133Ba by efficiency extrapolation method and calibration of ionisation chamber
Applied Radiation and Isotopes ( IF 1.6 ) Pub Date : 2021-04-24 , DOI: 10.1016/j.apradiso.2021.109744
Anuradha Ravindra , D.B. Kulkarni , V. Sathian , Probal Chaudhury , S.S. Dahiwale , Sanjay D. Dhole

133Ba has been standardised by direct measurements for the first time in the laboratory using two counting systems: (i) the 4πβ (plastic scintillator) -γ coincidence, (ii) the 4πβ (proportional counter) -γ coincidence. Furthermore, this standardisation experiment demonstrates the performance and applicability of the recently developed 4πβ (plastic scintillator)-γ coincidence system for radionuclides decaying with complex decay schemes as well as for e, X-γ emitters. Additionally, 133Ba solution standards were prepared to calibrate the pressurized 4π γ ionisation chamber and determination of the calibration coefficient. The En score is a statistical indicator of the agreement between two independent estimations. Thus, the performance of the PS system was compared to the result obtained with the PC system using the En score as specified in the ISO13528:2015. The results of measurements are acceptable if En ≦ 1.0. An En score of 0.2 was obtained which indicates that, the 133Ba activity concentration obtained by the 4πβ (plastic scintillator) -γ coincidence and 4πβ (proportional counter) -γ coincidence systems are in agreement. This paper presents the standardisation procedure, the results obtained by the measurements and their comparison.



中文翻译:

通过效率外推法和电离室校准对133 Ba进行标准化

133 Ba在实验室中首次通过直接测量使用两个计数系统进行了标准化:(i)4πβ(塑料闪烁体)-γ符合,(ii)4πβ(比例计数器)-γ符合。此外,该标准化实验证明了最近开发的4πβ(塑料闪烁体)-γ重合系统的性能和适用性,该系统适用于通过复杂衰变方案衰变的放射性核素以及e,X-γ发射体。另外,准备了133 Ba溶液标准液以校准加压的4πγ电离室并确定校准系数。该Ë ñ分数是两个独立估计之间一致性的统计指标。因此,将PS系统的性能与PC系统使用ISO 13528:2015中指定的E n得分获得的结果进行比较。测量的结果是,如果可接受Ë Ñ  ≦1.0。得到的E n值为0.2,表明通过4πβ(塑料闪烁体)-γ符合系统和4πβ(比例计数器)-γ符合系统获得的133 Ba活性浓度一致。本文介绍了标准化程序,通过测量获得的结果及其比较。

更新日期:2021-04-29
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