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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Comparison of two direct LS methods for measuring 222Rn in drinking water using alpha/beta liquid scintillation spectrometry.
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Comparison of two direct LS methods for measuring 222Rn in drinking water using alpha/beta liquid scintillation spectrometry.

机译：使用α/β液体闪烁光谱法测量饮用水中222Rn的两种直接LS方法的比较。

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摘要

Direct liquid scintillation (LS) methods are widely used for surveying (222)Rn in drinking water. Two direct methods are used that differ in sample composition. In a two-phase sample, water lies below a water-immiscible cocktail, while in a homogeneous sample water is mixed with an emulsifying cocktail. Although these methods were developed in the late 1970s, their performances have not been simultaneously tested. Here, the methods were compared in two ways: by preparing both types of sample similarly from (222)Rn-bearing groundwater in one emulsifying and in three organic cocktails, and by calibrating the methods with a (226)Ra standard according to their respective procedures. The samples were measured using alpha/beta LS spectrometry. The standard deviations of parallel samples and the repeatability of the measurements were excellent for both methods, except two-phase (226)Ra samples, whose efficiencies decreased slightly over time. This instability was due to interference from (210)Pb, (210)Bi and (210)Po, which accumulated in the (226)Ra standard, and possibly also to the migration of (214)Pb and (214)Bi into the aqueous phase and deficient transfer of (222)Rn from the water to the cocktail.
机译：直接液体闪烁（LS）方法被广泛用于测量饮用水中的（222）Rn。使用两种直接方法，它们的样品组成不同。在两相样品中，水位于与水不混溶的混合物下方，而在均质样品中，水与乳化混合物混合。尽管这些方法是在1970年代后期开发的，但尚未同时测试其性能。在这里，通过两种方法对方法进行了比较：通过在一种乳化液和三种有机混​​合物中从含（222）Rn的地下水中相似地制备两种样品，以及根据各自的方法使用（226）Ra标准品对方法进行校准程序。使用α/βLS光谱法测量样品。两种方法的平行样品的标准偏差和测量的重复性均非常好，除了两相（226）Ra样品外，其效率随时间略有下降。这种不稳定性是由于（210）Pb，（210）Bi和（210）Po的干扰（它们在（226）Ra标准中积累），也可能是由于（214）Pb和（214）Bi迁移到了水相和（222）Rn从水向鸡尾酒的转移不足。

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