Hivatkozási szám

MSZ EN ISO 22125-1:2020

Dokumentumazonosító

174740

Cím

Vízminőség. Technécium-99. 1. rész: Folyadékszcintillációs mérési módszer (ISO 22125-1:2019)

Angol cím

Water quality. Technetium-99. Part 1: Test method using liquid scintillation counting (ISO 22125-1:2019)

Alkalmazási terület

This document specifies a method for the measurement of ^99ˇTc 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^-1ˇ to 20 Bq·kg^-1ˇ, which is lower than the WHO criteria for safe consumption of drinking water (100 Bq l^-1ˇ)^[3]ˇ. 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 ^99ˇTc. 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 ^99ˇTc 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 ^99mˇTc is present at quantities that could cause interference and not if ^99mˇTc 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.

ICS

13.060.60 Víz fizikai tulajdonságainak vizsgálata

17.240 Sugárzásmérések

Műszaki Bizottság

A szabvány nyelve

angol

Az érvényesség kezdete

2020-05-01

Forrás

idt EN ISO 22125-1:2019; idt ISO 22125-1:2019

Előd

Utód

Módosítás

Kiegészítő információk

SZK-közlemények

Kapcsolódó európai jogszabály

A szabvány

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