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  • BSI
    20/30406489 DC BS EN ISO 10703. Water quality. Gamma-ray emitting radionuclides. Text method using gamma-ray spectrometry
    Edition: 2020
    $42.22
    / user per year

Description of 20/30406489 DC 2020

This document specifies a method for the physical pre-treatment and conditioning of water samples and the determination of the activity concentration of various radionuclides emitting gamma rays with energies 40 keV < E < 2 MeV, by gamma‑ray spectrometry according to the generic test method described in ISO 20042[9].

NOTE

The determination of the activity concentration of radionuclides emitting gamma rays with energy below 40 keV and above 2 MeV is also possible within the scope of this document, provided both the calibration of the measuring system and the shielding are adapted to this purpose.

This document is only applicable to homogeneous samples. The lowest limit that can be measured as such, i.e. without dilution or concentration of the sample or anti Compton device is about 5.10-2 Bq/l for eg 137Cs. The upper limit of the activity corresponds to a dead time of 5%.

Depending on different factors, such as the energy of the gamma rays and the emission probability per nuclear disintegration, the size and geometry of the sample and the detector, the shielding, the counting time and other experimental parameters, the sample is concentrated by evaporation when activities below 5.10-2 Bq/l have to be measured. However, volatile radionuclides (e.g. radon and radioiodine) can be lost during the source preparation.

When the dead time is higher than 5%, the sample is either diluted or an aliquot of the sample is taken or the source to detector distance is increased or a correction for pile‑up effects is applied.



Standard Number20/30406489 DC
TitleBS EN ISO 10703. Water quality. Gamma-ray emitting radionuclides. Text method using gamma-ray spectrometry
StatusDefinitive
Publication Date2020-03-05
Identical National Standard OfISO/DIS 10703
DescriptorsSpectroscopy, Quality, Water, Radionuclides, Gamma-ray lasers, Gamma-ray spectroscopy, Gamma-rays
ICS17.240 Radiation measurements, 13.060.60 Examination of physical properties of water
CommitteeEH/3/8
PublisherBSI
Pages29

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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