ISO 4722-1:2023 PDF

Name: ISO 4722-1:2023 — Water quality — Thorium 232 — Part 1: Test method using alpha spectrometry
SKU: ISO 4722-1:2023
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Water quality — Thorium 232 — Part 1: Test method using alpha spectrometry

Название (английский):

ISO 4722-1:2023

Water quality — Thorium 232 — Part 1: Test method using alpha spectrometry

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 18
Дата публикации:: 16 октября 2023 г.
Издание:: ISO IS 4722 edition 1 version 1
ICS:: 13.060.60

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Описание (английский):

This document specifies the method and the conditions for the determination of 232Th activity concentration in samples of environmental water (including sea waters) and waste waters before release to the environment using alpha spectrometry and 229Th as a recovery tracer. A chemical separation allows to separate and purify thorium from a test portion of the sample. The general principles outlined in this document can be applied for the analysis of other alpha-emitting thorium isotopes such as 228Th and 230Th in aqueous samples.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 4722-1:2023 - Water quality - Thorium 232 - Part 1: Test method using alpha spectrometry - specifies a laboratory method for determining the activity concentration of 232Th in environmental water (including sea water) and waste water prior to discharge. The method uses alpha spectrometry with 229Th as a recovery tracer and a chemical separation step to isolate and purify thorium from test portions. The standard also notes that the same principles can be applied to other alpha-emitting thorium isotopes (for example, 228Th and 230Th).

Key facts:

Detection capability: for ~500 ml test portions, the detection limit is approximately 5 mBq·L⁻¹ with a counting time of about 200 000 s (adjustable for different operational needs).

Emphasises proper sampling, handling and storage, chemical reagents and equipment, and rigorous quality control.

Key Topics and Technical Requirements

Principle: addition of 229Th tracer, equilibration, chemical concentration/separation and alpha spectrometric measurement.

Chemical separation and source preparation: methods to separate and purify thorium prior to electrodeposition or coprecipitation for counting (informative annexes provide guidance).

Measurement and quality control:

Chemical recovery assessment using the 229Th tracer.
Background determination and counting efficiency.
Spectrum analysis and calculation of activity concentration.
Determination and reporting of standard uncertainty, decision threshold, detection limit, and coverage intervals.

Sampling and sample volume: guidance for environmental and waste waters, with flexibility to modify volume/counting time to meet detection or regulatory limits.

Reporting: content requirements for the test report, including results and associated uncertainties.

Safety and competence: work should be performed by trained personnel following laboratory safety practices.

Practical Applications and Users

ISO 4722-1:2023 is intended for:

Environmental and radiochemical laboratories performing routine monitoring of radioactivity in drinking water, surface water, groundwater and sea water.

Regulatory agencies and water utilities assessing compliance with national or WHO guidance levels for thorium in drinking water and effluents.

Nuclear industry, mining and waste management entities monitoring liquid discharges containing naturally occurring radioactive materials (NORM).

Emergency response and research laboratories requiring reliable alpha-spectrometric determination of thorium isotopes.

Benefits:

Provides a harmonized, traceable method for 232Th activity concentration measurement.

Supports compliance assessment, public health protection and environmental monitoring programs.

Related Standards

Normative and informative references cited in ISO 4722-1:2023 include:

ISO 5667 series (sampling and preservation of water samples)

ISO 3696 (water for analytical laboratory use)

ISO 11929-1 (characteristic limits for ionizing radiation measurements)

ISO/IEC 17025 (laboratory competence)

ISO 80000-10 (atomic and nuclear physics quantities and units)

For laboratories implementing ISO 4722-1:2023, refer to these related standards to ensure sampling quality, measurement uncertainty handling, and laboratory accreditation compliance.

ISO 4722-1:2023 PDF

Abstract

Похожие стандарты

Overview

Key Topics and Technical Requirements

Practical Applications and Users

Related Standards

Технические детали

BS ISO 5667-21:2010

Water quality. Sampling - Guidance on sampling of drinking water distributed by tankers or means other than d…

SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)

SIST EN ISO 11929-1:2026

Determination of the characteristic limits (decision threshold, detection limit and limits of the coverage in…

ISO 6141:2015/Amd 1:2020

Gas analysis — Contents of certificates for calibration gas mixtures — Amendment 1: Cross reference list to I…

SIST EN ISO 80000-10:2019/A1:2026

Quantities and units - Part 10: Atomic and nuclear physics - Amendment 1 (ISO 80000-10:2019/Amd 1:2025)