^(226)Ra-^(222)Rn平衡未知样品快速报告^(226)Ra活度的γ谱方法的可能性研究  

Possibility of rapidly reporting ^(226)Ra activity in ^(226)Ra-^(222)Rn samples with unknown equilibrium factor by γ spectrometer

作　　者：苏琼[1] 郑锐[1] 陈勇[1] 程建平[1] 

机构地区：[1]清华大学工程物理系核技术研究所,北京100084

出　　处：《核技术》2005年第11期826-832,共7页Nuclear Techniques

摘　　要：本文报告了用γ谱仪分析技术对土壤、水泥、原煤、矿泉水和岩石等不同类型样品的226Ra-222Rn平衡系数随样品密封时间的跟踪观测。结果表明,它们依样品和样品制备方法不同而无简单规律性。文中提出了样品的前平衡时间和相应的前平衡系数概念,并进而导出了对于226Ra-222Rn平衡系数未知的226Ra-222Rn未平衡样品快速报告226Ra活度的γ谱测量和数据处理方法。文中明确指出:对226Ra-222Rn平衡系数未知的样品快速报告出不至于置疑的可靠检测结果,不可能做到当天收(送)样品当天出检验测试报告;但是,采用本文提出的测量和数据处理方法,对于那些活度不太低的样品来说,在收样后3到7天出检验测试报告是极具可能的,而不至于非要在收(送)样品后一个月左右才能见到检验测试报告,从而大大缩短了等待时间。This paper reports the observed changes for equilibrium factors between ^226Ra and ^222Rn with sealing time of the samples. The sanaples include soil, raw coal, mineral water, cement, rock, etc. Especially the conceptions of “pre-equilibrium time” and “pre-equilibrium factor” have been put forward and methods of measuring and processing data have been given which can be used for rapidly reporting activity of ^226Ra in samples with unknown equilibrium factor. It is definitely concluded that, using methods given in the paper, a test report will be completed in 3-7 days, instead of one month, after receiving the sample whose activity is not lower than LLD of the spectrometer.

关 键 词：Γ谱仪 ^226Ra-^222Rn样品 放射性久期平衡 

分 类 号：O615.13[理学—无机化学]