oSIST prEN ISO 10704:2025

Water quality - Gross alpha and gross beta activity - Test method using thin source deposit (ISO/DIS 10704:2025)

This document specifies a method for the determination of gross alpha and gross beta activity concentration for alpha- and beta-emitting radionuclides. Gross alpha and gross beta activity measurement is not intended to give an absolute determination of the activity concentration of all alpha and beta emitting radionuclides in a test sample, but is a screening analysis to ensure particular reference levels of specific alpha and beta emitters have not been exceeded. This type of determination is also known as gross alpha and gross beta index. Gross alpha and gross beta analysis is not expected to be as accurate nor as precise as specific radionuclide analysis after radiochemical separations.
Maximum beta energies of approximately 0,1 MeV or higher are well measured. It is possible that low energy beta emitters can not detected (e.g. 3H, 55Fe, 241Pu) or can only be partially detected (e.g. 14C, 35S, 63Ni, 210Pb, 228Ra).
The method covers non-volatile radionuclides, since some gaseous or volatile radionuclides (e.g. radon and radioiodine) can be lost during the source preparation.
The method is applicable to test samples of drinking water, rainwater, surface and ground water as well as cooling water, industrial water, domestic and industrial wastewater after proper sampling, sample handling, and test sample preparation (filtration when necessary and taking into account the amount of dissolved material in the water).
The method described in this document is applicable in the event of an emergency situation, because the results can be obtained in less than 1 h. Detection limits reached for gross alpha and gross beta are less than 10 Bq/l and 20 Bq/l respectively. The evaporation of 10 ml sample is carried out in 20 min followed by 10 min counting with window-proportional counters.
It is the laboratory's responsibility to ensure the suitability of this test method for the water samples tested.

Wasserbeschaffenheit - Gesamt-Alpha- und Gesamt-Beta-Aktivität - Dünnschichtverfahren (ISO/DIS 10704:2025)

Qualité de l'eau - Activités alpha globale et bêta globale - Méthode d'essai par dépôt d'une source fine (ISO/DIS 10704:2025)

Le présent document spécifie une méthode pour la détermination des activités volumiques alpha globale et bêta globale pour des radionucléides émetteurs alpha et bêta. Le mesurage des activités alpha globale et bêta globale n'est pas destiné à déterminer de façon absolue l'activité volumique de tous les radionucléides émetteurs alpha et bêta dans un échantillon pour essai, mais à s'assurer, par dépistage, que les niveaux de référence particuliers des émetteurs spécifiques alpha et bêta n'ont pas été dépassés. Ce type de détermination est également connu en tant qu'indice alpha et bêta global. On ne s'attend pas à ce que l'analyse alpha et bêta globale soit aussi précise que l'analyse de radionucléides spécifiques après séparations radiochimiques.
Des énergies bêta maximales sont correctement mesurées à partir d'environ 0,1 MeV ou plus. Les émetteurs bêta de faible énergie peuvent ne pas être détectés (par exemple 3H, 55Fe, 241Pu) ou peuvent être seulement partiellement détectés (par exemple 14C, 35S, 63Ni, 210Pb, 228Ra).
La méthode couvre les radionucléides non volatils, car certains radionucléides gazeux ou volatils (par exemple le radon et l'iode radioactif) peuvent être perdus au cours de la préparation de la source.
La méthode d'essai est applicable à des échantillons pour essai d'eau potable, d'eau de pluie, d'eau de surface et d'eau souterraine ainsi que d'eau de refroidissement, d'eau industrielle, d'eaux usées domestiques et industrielles après échantillonnage approprié, manipulation de l'échantillon et préparation de l'échantillon pour essai (filtration si nécessaire et en tenant compte de la quantité de matières dissoutes dans l'eau).
La méthode décrite dans le présent document est applicable dans le cas d'une situation d'urgence car les résultats peuvent être obtenus en moins d'1 h. Les limites de détection atteintes pour l'activité alpha globale et l'activité bêta globale sont inférieures à 10 Bq/L et 20 Bq/L, respectivement. L'évaporation d'un échantillon de 10 mL s'effectue en 20 min et est suivie d'un comptage de 10 min à l'aide de compteurs proportionnels à fenêtre.
Il incombe au laboratoire de s'assurer de l'aptitude à l'emploi de cette méthode d'essai pour les échantillons d'eau soumis à essai.

Kakovost vode - Skupna alfa in skupna beta aktivnost - Preskusna metoda z odlaganjem v tankem sloju (ISO/DIS 10704:2025)

General Information

• Status: Not Published
• Public Enquiry End Date: 02-Nov-2025
• ICS: 13.060.60 - Examination of physical properties of water
• ICS: 13.280 - Radiation protection
• Technical Committee: KAV - Water quality
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 10-Sep-2025
• Due Date: 28-Jan-2026
• Ref Project: prEN ISO 10704 - Water quality - Gross alpha and gross beta activity - Test method using thin source deposit (ISO/DIS 10704:2025)

Relations

• Revises: SIST EN ISO 10704:2019 - Water quality - Gross alpha and gross beta activity - Test method using thin source deposit (ISO 10704:2019)
• Effective Date: 01-Oct-2025

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2025
Kakovost vode - Skupna alfa in skupna beta aktivnost - Preskusna metoda z
odlaganjem v tankem sloju (ISO/DIS 10704:2025)
Water quality - Gross alpha and gross beta activity - Test method using thin source
deposit (ISO/DIS 10704:2025)
Wasserbeschaffenheit - Gesamt-Alpha- und Gesamt-Beta-Aktivität -
Dünnschichtverfahren (ISO/DIS 10704:2025)
Qualité de l'eau - Activités alpha globale et bêta globale - Méthode d'essai par dépôt
d'une source fine (ISO/DIS 10704:2025)
Ta slovenski standard je istoveten z: prEN ISO 10704
ICS:
13.060.60 Preiskava fizikalnih lastnosti Examination of physical
vode properties of water
13.280 Varstvo pred sevanjem Radiation protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 10704
ISO/TC 147/SC 3
Water quality — Gross alpha and
Secretariat: AFNOR
gross beta activity — Test method
Voting begins on:
using thin source deposit
2025-08-27
Qualité de l'eau — Activités alpha globale et bêta globale —
Voting terminates on:
Méthode d'essai par dépôt d'une source fine
2025-11-19
ICS: 13.060.60; 13.280
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
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This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 10704:2025(en)
DRAFT
ISO/DIS 10704:2025(en)
International
Standard
ISO/DIS 10704
ISO/TC 147/SC 3
Water quality — Gross alpha and
Secretariat: AFNOR
gross beta activity — Test method
Voting begins on:
using thin source deposit
Qualité de l'eau — Activités alpha globale et bêta globale —
Voting terminates on:
Méthode d'essai par dépôt d'une source fine
ICS: 13.060.60; 13.280
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
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or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 10704:2025(en)
ii
ISO/DIS 10704:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols . 2
5 Principle . 3
6 Chemical reagents and equipment . 3
6.1 Reagents .3
6.1.1 General .3
6.1.2 Standard solutions .3
6.1.3 Wetting or surfactant agents .4
6.1.4 Volatile organic solvents .4
6.1.5 Ultrapure water, with a resistivity of more than 18,2 MΩ cm at 25 °C and total
−1
organic carbon less than 1 μg∙l .4
6.1.6 Specific reagents for alpha-emitting radionuclides co-precipitation .4
6.2 Equipment .4
6.2.1 Laboratory equipment for direct evaporation.4
6.2.2 General equipment .5
6.2.3 Special equipment for alpha-emitting radionuclide co-precipitation .5
6.2.4 Measurement equipment .5
7 Sampling . 5
8 Procedure . 5
8.1 Preliminary .5
8.2 Source preparation .6
8.2.1 Preparation of planchet . .6
8.2.2 Evaporation .6
8.2.3 Co-precipitation .6
8.3 Counting stage .7
8.4 Background and blank determination .7
8.5 Preparation of counting standard for calibration .8
8.6 Preparation of calibration source for self-absorption determination .8
8.6.1 General .8
8.6.2 Spiking one of two test portions .8
8.6.3 Self-absorption curve .8
9 Expression of results . 9
9.1 General .9
9.2 Alpha activity concentration .9
9.3 Beta activity concentration .9
9.4 Standard uncertainty of the alpha activity concentration .10
9.5 Standard uncertainty of the beta activity concentration .11
9.6 Decision threshold . 12
9.6.1 Decision threshold of the alpha activity concentration. 12
9.6.2 Decision threshold of the beta activity concentration . 12
9.7 Limit of detection . 12
9.7.1 Limit of detection of the alpha activity concentration . 12
9.7.2 Limit of detection of the beta activity concentration . 13
9.8 Limits of the coverage intervals . . 13
9.8.1 Limits of the probabilistically symmetric coverage interval . 13
9.8.2 The shortest coverage interval .14
10 Control of interferences . 14

iii
ISO/DIS 10704:2025(en)
10.1 General .14
10.2 Relative humidity .14
10.3 Geometry of the deposit .16
10.4 Crosstalk .
...