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    • Home
    • ICS
    • Environment. Health Protection. Safety
    • Water Quality
    • Examination Of Physical Properties Of Water
    • ISO 11704:2018

    Codes & Standards - Purchase

    ISO 11704:2018

    Water quality — Gross alpha and gross beta activity — Test method using liquid scintillation counting
    SKU: iso_071996_165441 Published by ISO Publication Year 2018 2 Edition 19 pages

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    This document specifies a method for the determination of gross alpha and gross beta activity concentration for alpha- and beta-emitting radionuclides using liquid scintillation counting (LSC).
    The method is applicable to all types of waters with a dry residue of less than 5 g/l and when no correction for colour quenching is necessary.
    Gross alpha and gross beta activity measurement is not intended to give an absolute determination of the activity concentration of all alpha- and beta-emitting radionuclides in a test sample, but is a screening analysis to ensure particular reference levels of specific alpha and beta emitters have not been exceeded. This type of determination is also known as gross alpha and beta index. Gross alpha and beta analysis is not expected to be as accurate nor as precise as specific radionuclide analysis after radiochemical separations.
    The method covers non-volatile radionuclides below 80 °C, since some gaseous or volatile radionuclides (e.g. radon and radioiodine) can be lost during the source preparation.
    The method is applicable to test samples of drinking water, rain water, surface and ground water as well as cooling water, industrial water, domestic and industrial waste water after proper sampling and test sample preparation (filtration when necessary and taking into account the amount of dissolved material in the water).
    The method described in this document is applicable in the event of an emergency situation, because the results can be obtained in less than 4 h by directly measuring water test samples without any treatment.
    It is the laboratory's responsibility to ensure the suitability of this test method for the water samples tested.

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