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

Standard No.

ISO 18589-5:2019

Release Date

2019

Published By

International Organization for Standardization (ISO)

Status

Be replaced

Replace By

ISO 18589-5:2020

Latest

ISO 18589-5:2020

Scope

This document describes the principles for the measurement of the activity of 90Sr in equilibrium with 90Y and 89Sr, pure beta emitting radionuclides, in soil samples. Different chemical separation methods are presented to produce s trontium and yttrium sources, the activity of which is determined using proportional counters (PC ) or liquid scintillation counters (LSC ) . 90Sr can be obtained from the test samples when the equilibrium between 90Sr and 90Y is reached or through direct 90Y 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 pas t 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 s trontium activity will not be negligible. This standard provides the measurement method to determine the activity of 90Srin presence of89Sr. The test methods described in this document can also be used to measure the radionuclides in sludge, sediment, cons truction material and products by following proper sampling procedure. Using samples sizes of 20 g and counting times of 1000 min, detection limits of (0,1 to 0, 5 ) Bq·kg -1 can be achievable for 90Sr using conventional and commercially available proportional counter or liquid scintillation counter when the presence of89Sr can be neglected. If89Sr is present in the test sample, detection limits of (1 to 2) Bq·kg -1 can be obtained for both 90Sr and 89Sr using the same sample size, counting time and proportional counter or liquid scintillation counter as in the previous situation.

ISO 18589-5:2019 Referenced Document

• ISO 11074 Soil quality. Vocabulary revision 1*， 2024-04-22 Update
• ISO 19361 Measurement of radioactivity — Determination of beta emitters activities — Test method using liquid scintillation counting
• ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories [Standard in French]
• ISO/IEC Guide 98-3 Uncertainty of measurement - Guide to the expression of uncertainty in measurement (GUM:1995). Extension to any number of output quantities

ISO 18589-5:2019 history

• 2020 ISO 18589-5:2020 Measurement of radioactivity in the environment - Soil - Part 5: Strontium 90 - Test method using proportional counting or liquid scintillation counting
• 2019 ISO 18589-5:2019 Measurement of radioactivity in the environment — Soil — Part 5: Strontium 90 — Test method using proportional counting or liquid scintillation counting
• 2009 ISO 18589-5:2009 Measurement of radioactivity in the environment - Soil - Part 5: Measurement of strontium 90