Measurement of the 134Cs half-life in support of the exponential-decay law

IF 2.8 1区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Data Sheets Pub Date : 2024-07-14 DOI:10.1016/j.nds.2024.06.001

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Abstract

The half-life of ¹³⁴Cs has been determined through 882 and 471 activity measurements of two sources over 12 years with a re-entrant ionisation chamber in a temperature-stabilised room. The data were aggregated from in total 204 565 and 99 486 ionisation current measurements with 0.057 % standard deviation. The decay curves adhere to the exponential-decay law, devoid of any cyclic perturbations at daily, monthly, and multi-annual scales, maintaining an exceptionally low standard deviation of 0.0003 % on the amplitude. A discernible annual cycle with an amplitude of 0.0051 (3) % was effectively mitigated to an insignificant level of 0.0009 (3) % by compensating the residuals proportionally to daily variations in ambient humidity. The study yielded a half-life value for ¹³⁴Cs of 754.200 (53) d or 2.06493 (14) a, with a relative standard uncertainty of 0.0070 %. The result obtained in this work can be recommended as a reference value, owing to its high statistical accuracy and conservative estimate of systematic errors.

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测量 134Cs 的半衰期以支持指数衰变规律

134Cs 的半衰期是通过在温度稳定的房间内使用重入式电离室对两个放射源在 12 年内分别进行 882 次和 471 次放射性活度测量而确定的。这些数据分别来自 204 565 和 99 486 次电离电流测量，标准偏差为 0.057%。衰减曲线符合指数衰减规律，在日、月和多年尺度上没有任何周期性扰动，振幅的标准偏差极低，仅为 0.0003%。振幅为 0.0051 (3) % 的明显年周期，通过按环境湿度的日变化比例补偿残差，有效地降低到 0.0009 (3) % 的微不足道的水平。研究得出 134Cs 的半衰期值为 754.200 (53) d 或 2.06493 (14) a，相对标准不确定性为 0.0070 %。由于统计精度高，对系统误差的估计也比较保守，因此这项研究得出的结果可以作为参考值。

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来源期刊

Nuclear Data Sheets 物理-物理：核物理

CiteScore

7.80

自引率

5.40%

发文量

审稿时长

>12 weeks

期刊介绍： The Nuclear Data Sheets are current and are published monthly. They are devoted to compilation and evaluations of experimental and theoretical results in Nuclear Physics. The journal is mostly produced from Evaluated Nuclear Structure Data File (ENSDF), a computer file maintained by the US National Nuclear Data Center