87Krγ射线发射几率的重新测定.pdfVIP

第44稀粥5期 原子能科学技术 Vo l. 44 ,No. 5 2010年5月 Atomic Energy Science and Technology May 2010 87Krγ 射线发射几率的重新测定 解峰，何小兵，张小林，类文刚，包敏，李雪松，刘 感，师企林 (商:lt核技术研究所，陕西商安 710024) 摘要:在以往盯Kr 的测量实验中，壁效应校正和 HPGe 探测器效率刻度结果不确定度均较大.本工作针 对存在的问题，改进了实验装置，准确进行了壁效应校底，用长度补偿法测得了放射性活度浓度为 100.87(1 土0.86%) Bq/mL; 重新设计加工了能准确标定 HPGe 探测器效率的源盒，测得87Kr 402.6 keVγ 射线的发射几率为 49.46%0 士1. 9%). 关键诩 :S7Kr; 长度补偿法，活度浓度s 发射几率$内充气.iE比计数管;HPGe 探测器 中圈分类号:TL84 文献标志码:A 文.编号:1000-6931(2010)05心517-06 Redetermination ofγEmission Probability for 87 Kr XIE Feng , HE Xiao-bing , ZHANG Xiao-lin , JIANG Wen-gang , BAO Min , LI Xue-song , LlU Jie , SHI Quan-lin (Northwest 1帽stitute 01 Nuclear Technology , Xian 710024 , China) Abstract: Uncertainty of result for wall effect correction and eHiciency calibration was bigger in our previous experiment about 87 Kr. In order to solve the problem , the experiω ment equipment was improved , and wall effect was exactly corrected in present work. Radioactive concentration of 87 Kr was measured by internal gas proportional counters , the result is 100.87(1士 0.86%) Bq/mL. The source box which can exactly calibrated the efficiency of HPGe detector was desìgned again. Emìssion probability of 87Kr 402.6 keV 沪ray was determined to be 49. 46 % (1 -七1. 9%λ Key words: 87Kr; length-compensated method; radioactive concentration; emissÎon pro- bability; internal gas proportional counter; HPGe detector 87 Kr是 1∞%旷衰变，半亵期为 76. 3 nún[l] , 最结果，文献[5J 输出了87 Kr 至87 Rb 幕态伊射 87 其子体87Rb ~是稳恋核素• Kr 是气体措测定核 线强度，文献[IJ 对以上测量数据评价后，通过 燃料裂变燃耗的重要核素，准确的 y 射线发射