标准编号：ISO 11704:2018
中文名称：水质 非盐水中α和β总活性浓度 液相闪烁计数试验方法
英文名称：Water quality — Gross alpha and gross beta activity — Test method using liquid scintillation counting
发布日期：2018-11
标准范围
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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