地质水样品总α总β放射性检测技术探讨

Study on Radioactivity Detection of Total α Total β in Geological Water Samples

水中总α放射性检测有厚样法、比较测量法、标准曲线法等检测方法。总β放射性有薄样法、活性炭吸附法等检测方法。本文按照地质矿产行业标准,结合生活饮用水和矿泉水检测标准,使用厚样法测量总α放射性,使用薄样法测量总β放射性。通过对有效厚度和最大取样量的确定,得到最佳的残渣取样量为160mg。使用BH1216Ⅲ型二路低本底αβ测量仪,同时测量地质水样品中总α总β放射性。用实际样品进行检测,相对偏差不高于20%,样品检测重复性良好。

Thick-sample method,comparison method and standard curve method can be used to detect total α radioactivity in water.Thin-sample method and activated carbon adsorption method can be used to detect total β radioactivity in water.Following geological occupation standard,drinking detection standard and mineral water detection standard,this research use thick-sample method to detect total α radioactivity and use thin-sample method to detect total β radioactivity.By confirming effective thickness and maximal sample quantity,the best sample quantity,which is 160mg,can be achieved.Use BH1216Ⅲ Low background α and β measuring instrument to detect total α and total β at the same time,which can increase the detecting efficiency.Testing with actual sample,the relative deviation is lower than 20 %.The repeatability of sample detection is good.