Salonen Laina
Radon Safety, STUK-Radiation and Nuclear Safety Authority, P.O. Box 14, FIN-00881 Helsinki, Finland.
Appl Radiat Isot. 2010 Jan;68(1):131-8. doi: 10.1016/j.apradiso.2009.08.006. Epub 2009 Aug 21.
The standard ASTM method is the most commonly applied method for determining (222)Rn in drinking water. The method is calibrated with a (226)Ra standard solution that usually contains variable amounts of (210)Pb, (210)Bi and (210)Po if the standard has not recently been purified. Until now it has not been experimentally confirmed that these progenies do not interfere when the method is calibrated. In this study, interference was examined using three different organic cocktails and alpha/beta liquid scintillation spectrometry to separately assess the effect of three radionuclides. The interference from (210) Po was 4% for one of the cocktails if the (226)Ra standard had been purified 5 years earlier. The interferences from (210)Pb and (210)Bi were negligible compared to that of (210)Po.
美国材料与试验协会（ASTM）的标准方法是测定饮用水中（222）Rn最常用的方法。该方法用（226）Ra标准溶液进行校准，如果该标准溶液最近未进行纯化，通常会含有不同量的（210）Pb、（210）Bi和（210）Po。到目前为止，尚未通过实验证实这些子体在该方法校准时不会产生干扰。在本研究中，使用三种不同的有机混合液和α/β液体闪烁光谱法来检验干扰，以分别评估三种放射性核素的影响。如果（226）Ra标准溶液在5年前已进行纯化，对于其中一种混合液，（210）Po的干扰为4%。与（210）Po相比，（210）Pb和（210）Bi的干扰可忽略不计。
