Abstract
The results of NPL's twenty-fifth Environmental Radioactivity Proficiency Test Exercise are reported. Five different sample types were offered: an aqueous mixtures of one alpha emitter and three beta emitters (designated `AB'), an aqueous mixture of three alpha emitters (`A1'), an aqueous mixture of three beta emitters (`B1'), an aqueous mixture of four gamma emitters (`GH'), and a second aqueous mixture of four gamma emitters (`GL'). In total, over 450 results were submitted.
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