Wätjen U, Benedik L, Spasova Y, Vasile M, Altzitzoglou T, Beyermann M
European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Geel, Belgium.
Appl Radiat Isot. 2010 Jul-Aug;68(7-8):1200-5; discussion 1205-6. doi: 10.1016/j.apradiso.2009.11.007. Epub 2009 Nov 13.
In anticipation of new European requirements for monitoring radioactivity concentration in drinking water, IRMM organized an interlaboratory comparison on the determination of low levels of activity concentrations (about 10-100 mBq L(-1)) of the naturally occurring radionuclides (226)Ra, (228)Ra, (234)U and (238)U in three commercially available mineral waters. Using two or three different methods with traceability to the International System of Reference (SIR), the reference values of the water samples were determined prior to the proficiency test within combined standard uncertainties of the order of 3%-10%. An overview of radiochemical separation and measurement methods used by the 45 participating laboratories are given. The results of the participants are evaluated versus the reference values. Several of the participants' results deviate by more than a factor of two from the reference values, in particular for the radium isotopes. Such erroneous analysis results may lead to a crucial omission of remedial actions on drinking water supplies or to economic loss by an unjustified action.
为应对欧洲对饮用水放射性浓度监测的新要求，IRMM组织了一次实验室间比对，测定三种市售矿泉水中天然存在的放射性核素镭-226、镭-228、铀-234和铀-238的低活度浓度（约10 - 100毫贝克勒尔/升）。采用两种或三种可溯源至国际参考系统（SIR）的不同方法，在能力验证之前确定了水样的参考值，其合成标准不确定度约为3% - 10%。给出了45个参与实验室所使用的放射化学分离和测量方法的概述。将参与者的结果与参考值进行了评估。一些参与者的结果与参考值偏差超过两倍，特别是对于镭同位素。这种错误的分析结果可能导致对饮用水供应补救行动的关键遗漏，或因不合理行动造成经济损失。
