Methods are described for the determination of the fission products 89Sr 90Sr, l37Cs, 140Ba, 141Ce and l44Ce in rain and tapwaters, and in air filter samples. Details are given of the development of the methods and of the precautions required to achieve chemical and radiochemical purity of the final sources. Special low background counting equipment is used and the lower limit of detection of any of the nuclides is about 1 µµc.
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