This document specifies methods to determine 226Ra concentration by inductively coupled plasma mass spectrometry (ICP-MS). The mass concentrations obtained can be converted into activity concentrations.
The method is applicable to test samples of drinking water, rainwater, surface and ground water, after proper sampling and handling, and test sample preparation.
The detection limit depends on the sample volume, the instrument used, the background count rate, the detection efficiency, the counting time and the chemical yield. The detection limit of the method described in this document, using currently available equipment, is approximately 10 mBq·l-1, which is better than the WHO criteria for safe consumption of drinking water (1 Bq·l-1).
This method covers the measurement of 226Ra in water at activity concentrations between 0,001 Bq·l−1 and 100 Bq·l−1. Samples with concentrations higher than 1 Bq·l−1 can be measured if a dilution is performed.
The method described in this document is applicable in the event of an emergency situation.
In this method, filtration of the test sample is necessary. The analysis of 226Ra adsorbed to suspended matter is not covered by this method. The analysis of the insoluble fraction requires a mineralization step that is not covered by this document. In this case, the measurement is made on the different phases obtained.
It is the user’s responsibility to ensure the validity of this test method for the water samples tested.
针对日本排海核污水含有60多种放射物质,钛和推出了更为全面的放射性物质测试服务,详情如下:钛和食农:可检测的放射性物质:①y放射性核素:铯-137、 铯-134、钾-40、碘-131、钴-60、镭-226等所有发射可分辨γ特征谱线的核素;②β放射性核素:锶-90、锶-89③α放射性核素:钚-239、钚-240④其它:氚、总α放射性、总β放射性等可检测的样本类型:食品、饲料、水质、土壤、化妆品等资质:...
实验室污水中含有一些特殊的污染物,如药物、消毒剂、诊断用剂、洗涤剂、重金属、含油废水以及大量病原性微生物、寄生虫卵及各种病毒,如蛔虫卵、肝炎病毒、结核菌和痢疾菌等。此外,在设有同位素诊疗室的构废水中还含镭226、磷、金198、碘131等放射性物质。...
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