陶瓷材料放射性衰变时间及最佳平衡周期研究

Study on the Radioactive Decay Time and the Best Balance Time of Ceramic Materials

简述了有关放射性样品衰变平衡及平衡时间的基本理论,运用碘化钠γ谱仪对衰变时间介于0~27 d区间内的三组陶瓷样品进行放射性比活度测定,采取t检验法分析了同一样品在0 d^7 d、7 d^12 d、15 d、21 d等不同衰变时间条件下,放射性核素226Ra、232Th、40K比活度测试结果之间的差异程度,通过实验验证陶瓷样品衰变时间对其放射性测定结果准确性的影响。研究表明,当每组检测结果数据的显著性差异水平为5%,若兼顾科学性和经济性,则陶瓷样品的最佳放射性衰变时间应为至少21 d。

This paper sketched the theory of radioactive samples decay balance cycle and balance time. After measuring specific activity of three groups ceramic samples which radioactive decay balance time are between 0 to 27 days by sodium iodide γ-ray detector,then using t- test method to analyze the differences between specific activity test results of the natural radionuclide226Ra、232Th and40 K in the same samples under the condition of different decay balance time,such as 0 d ~ 7 d、7 d ~ 12 d、15 d、21 d,etc. Ceramic samples radioactive decay time have an effect to the accuracy of specific activity test results by experimental verification. Researches show that if the significant difference level of test result data is 5%,the best radioactive decay time should be at least 21 days for both scientific and economic optimal.