Water quality - Gross beta activity in non-saline water - Test method using thick source

This document provides a method for the determination of total beta radioactivity in water samples with low salinity using a thick source measurement technique. It outlines the principles, apparatus, reagents, and procedures necessary for the accurate measurement of beta activity. The method is applicable to a wide range of water types, including natural and treated waters. Detailed guidance is provided on sample preparation, measurement conditions, and the calculation of results. The standard also includes information on quality assurance and control measures to ensure the reliability and consistency of the measurements. It is intended for use by laboratories involved in the analysis of water samples for radiological purposes. The procedures described are suitable for routine and regulatory monitoring applications.