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ČSN EN ISO 22125-1 (757640)
Water quality - Technetium-99 - Part 1: Test method using liquid scintillation counting
Translate name
STANDARD published on 1.6.2020
The information about the standard:
Designation standards: ČSN EN ISO 22125-1
Classification mark: 757640
Catalog number: 509740
Publication date standards: 1.6.2020
SKU: NS-994088
The number of pages: 36
Approximate weight : 108 g (0.24 lbs)
Country: Czech technical standard
Category: Technical standards ČSN
The category - similar standards:
Examination of physical properties of waterRadiation measurements
Annotation of standard text ČSN EN ISO 22125-1 (757640):
This document specifies a method for the measurement of 99Tc in all types of waters by liquid scintillation counting (LSC). The method is applicable to test samples of supply/drinking water, rainwater, surface and ground water, as well as cooling water, industrial water, domestic, and industrial wastewater after proper sampling and handling, and test sample preparation. A filtration of the test sample is necessary. The detection limit depends on the sample volume and the instrument used. The method described in this document, using currently available LSC instruments, has a detection limit of approximately 5 Bq˙kg-1 to 20 Bq˙kg-1, which is lower than the WHO criteria for safe consumption of drinking water (100 Bq l-1). These values can be achieved with a counting time of 30 min for a sample volume varying between 14 ml to 40 ml. The method presented in this document is not intended for the determination of ultra-trace amount of 99Tc. The activity concentration values in this document are expressed by sample mass unit instead of sample volume unit as it is usually the case in similar standards. The reason is that 99Tc is measured in various matrix types such as fresh water or sea water, which have significant differences in density. The activity concentration values can be easily converted to sample volume unit by measuring the sample volume. However, it increases the uncertainty on the activity concentration result. The method described in this document is applicable in the event of an emergency situation, but not if 99mTc is present at quantities that could cause interference and not if 99mTc is used as a recovery tracer. The analysis of Tc adsorbed to suspended matter is not covered by this method. It is the user´s responsibility to ensure the validity of this test method for the water samples tested
Preview of the standard ČSN EN ISO 22125-1 (757640)
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