{"title":"Measurement of the 134Cs half-life in support of the exponential-decay law","authors":"","doi":"10.1016/j.nds.2024.06.001","DOIUrl":null,"url":null,"abstract":"<div><p>The half-life of <sup>134</sup>Cs 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 <sup>134</sup>Cs 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.</p></div>","PeriodicalId":49735,"journal":{"name":"Nuclear Data Sheets","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Data Sheets","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0090375224000383","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, NUCLEAR","Score":null,"Total":0}
引用次数: 0
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.
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
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