Hivatkozási szám

MSZ EN ISO 18589-5:2022

Dokumentumazonosító

178045

Cím

A környezeti radioaktivitás mérése. Talaj. 5. rész: Stroncium-90. Vizsgálati módszer proporcionális vagy folyadékszcintillációs számlálóval (ISO 18589-5:2019)

Angol cím

Measurement of radioactivity in the environment. Soil. Part 5: Strontium 90. Test method using proportional counting or liquid scintillation counting (ISO 18589-5:2019)

Alkalmazási terület

This document describes the principles for the measurement of the activity of ^90ˇSr in equilibrium with ^90ˇY and ^89ˇSr, pure beta emitting radionuclides, in soil samples. Different chemical separation methods are presented to produce strontium and yttrium sources, the activity of which is determined using proportional counters (PC) or liquid scintillation counters (LSC). ^90ˇSr can be obtained from the test samples when the equilibrium between ^90ˇSr and ^90ˇY is reached or through direct ^90ˇY measurement. The selection of the measuring method depends on the origin of the contamination, the characteristics of the soil to be analysed, the required accuracy of measurement and the resources of the available laboratories. These methods are used for soil monitoring following discharges, whether past or present, accidental or routine, liquid or gaseous. It also covers the monitoring of contamination caused by global nuclear fallout. In case of recent fallout immediately following a nuclear accident, the contribution of 89Sr to the total amount of strontium activity will not be negligible. This standard provides the measurement method to determine the activity of ^90ˇSr in presence of ^89ˇSr. The test methods described in this document can also be used to measure the radionuclides in sludge, sediment, construction material and products by following proper sampling procedure. Using samples sizes of 20 g and counting times of 1 000 min, detection limits of (0,1 to 0,5) Bq·kg^-1ˇ can be achievable for ^90ˇSr using conventional and commercially available proportional counter or liquid scintillation counter when the presence of ^89ˇSr can be neglected. If ^89ˇSr is present in the test sample, detection limits of (1 to 2) Bq·kg^-1ˇ can be obtained for both ^90ˇSr and ^89ˇSr using the same sample size, counting time and proportional counter or liquid scintillation counter as in the previous situation.

ICS

13.080.01 Talajminőség és talajtan általában

17.240 Sugárzásmérések

Műszaki Bizottság

A szabvány nyelve

angol

Az érvényesség kezdete

2022-02-01

Forrás

idt ISO 18589-5:2019; idt EN ISO 18589-5:2021

Előd

Utód

Módosítás

Kiegészítő információk

SZK-közlemények

Kapcsolódó európai jogszabály

A szabvány

kapható formátuma

Papír ,
PDF (letöltés) (a fájl mérete: 1932635) ,

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43 oldal; S kategória

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