伽马能谱法测量水中^(226)Ra最短平衡时间的确定  

Time determination of 226 Ra shortest balance time in water measured by gamma energy spectrum method

作　　者：曹诚彦[1] 徐步新[1] 陈美芳[1] 

机构地区：[1]江苏省地质调查研究院,江苏南京210018

出　　处：《地质学刊》2012年第2期219-221,共3页Journal of Geology

摘　　要：伽马(γ)能谱法测量水中226Ra,在制样过程中天然放射性核素衰变链遭到破坏,一般规定样品放射性平衡期为3～4周后测定。通过试验证明,样品天然放射性核素衰变链最终达到平衡的最短时间为11d,测量结果在允许误差范围内,满足测量精度。Along with an increasing scarcity of surface water, the extraction of ground water became more extensive, a large amount of usage of deep well water, mineral water and geothermal water made the feasibility of radioactive nuclide into the human body increased. The radioactive investigation in groundwater resource and the monitoring of ^226Ra in the drinking water were of great importance to the protection of human health. During the measurement of ^226Ra in water by gamma energy spectrum method, the natural radioactive nu- clide decay chain was broken in the course of sample preparation, so the measurement of sample would be conducted in three and four weeks for a balance period. The test demonstrated that the shortest time period was eleven days for balance for the natural radioactive nuclide decay chain, the detection results were in the range of the allowable error and met the measurement accuracy.

关 键 词：测量 天然放射性核素 衰变链 最短平衡时间 伽马能谱法 

分 类 号：O657.62[理学—分析化学]