DIN EN ISO 10703:2022-11
Water quality - Gamma-ray emitting radionuclides - Test method using high resolution gamma-ray spectrometry (ISO 10703:2021); German version EN ISO 10703:2021
| Fecha edición: |
2022-11-01
En Vigor
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| Idiomas disponibles: | Inglés, Alemán |
| Resumen: | 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. 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. |
| Keywords: | Activity|Activity concentration|Concentration|Definitions|Gamma-radiation|Gamma-ray spectrometry|Inspection|Interval|Radiation measurement|Radionuclides|Spectrometry|Water|Water pollution|Water practice|Water quality|Water testing |
| ICS: | 17.240 - Medición de radiaciones, 13.060.60 - Determinación de las propiedades físicas del agua |
| CTN: | |
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Equivalencia Internacional |
Idéntica EN ISO 10703:2021 Idéntica ISO 10703:2021 |
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Reemplazo Normas |
Reemplaza a DIN EN ISO 10703:2015-12 Reemplaza a DIN EN ISO 10703:2020-04 |
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