prEN ISO 11704
(Main)Water quality - Gross alpha and gross beta activity - Test method using liquid scintillation counting (ISO/DIS 11704:2025)
Water quality - Gross alpha and gross beta activity - Test method using liquid scintillation counting (ISO/DIS 11704:2025)
This document specifies a method for the determination of gross alpha and gross beta activity concentration for alpha- and beta-emitting radionuclides using liquid scintillation counting (LSC).
The method is applicable to all types of waters with a dry residue of less than 5 g/l and when no correction for colour quenching is necessary.
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 beta index. Gross alpha and beta analysis is not expected to be as accurate nor as precise as specific radionuclide analysis after radiochemical separations.
The method covers non-volatile radionuclides below 80 °C, 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, rain water, surface and ground water as well as cooling water, industrial water, domestic and industrial waste water after proper sampling 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 4 h by directly measuring water test samples without any treatment.
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 - Verfahren mit dem Flüssigszintillationszähler (ISO/DIS 11704:2025)
Qualité de l'eau - Activités alpha globale et bêta globale - Méthode d'essai par comptage des scintillations en milieu liquide (ISO/DIS 11704:2025)
Le présent document spécifie une méthode de détermination des activités volumiques alpha globale et bêta globale pour des radionucléides émetteurs alpha et bêta par comptage des scintillations en milieu liquide.
La méthode est applicable à tous les types d'eau ayant un résidu sec inférieur à 5 g/l et lorsqu'aucune correction n'est nécessaire pour l'affaiblissement lumineux de couleur.
Le mesurage des activités alpha globale et bêta globale n'est pas destiné à fournir une détermination absolue de l'activité volumique de tous les radionucléides émetteurs alpha et bêta dans un échantillon pour essai; il s'agit plutôt d'une analyse de contrôle visant à s'assurer que des niveaux de référence donnés d'émetteurs alpha et bêta n'ont pas été dépassés. Ce type de déterminations est également connu sous le nom d'indices alpha et bêta. Il ne faut pas s'attendre à ce que l'analyse des activités alpha globale et bêta globale soit aussi précise, ni aussi juste, que l'analyse de radionucléides spécifiques après séparation radiochimique.
Cette méthode couvre les radionucléides non volatils en dessous de 80 °C, étant donné que certains radionucléides gazeux ou volatils (par exemple, le radon et l'iode radioactif) peuvent être perdus lors de la préparation de la solution source.
Cette méthode peut s'appliquer 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'eaux industrielles, d'eaux usées domestiques et industrielles, après avoir procédé comme il se doit au prélèvement et à la préparation des échantillons pour essai (en les filtrant lorsque cela s'avère nécessaire et en tenant compte de la quantité de matière dissoute dans l'eau).
La méthode décrite dans le présent document est applicable en cas de situation d'urgence, car les résultats peuvent être obtenus en moins de 4 h en mesurant directement les échantillons d'eau pour essai sans aucun traitement.
Il incombe au laboratoire de s'assurer de la pertinence de la présente méthode d'essai pour les échantillons d'eau soumis à essai.
Kakovost vode - Skupna alfa in skupna beta aktivnost - Preskusna metoda s štetjem s tekočinskim scintilatorjem (ISO/DIS 11704:2025)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2025
Kakovost vode - Skupna alfa in skupna beta aktivnost - Preskusna metoda s
štetjem s tekočinskim scintilatorjem (ISO/DIS 11704:2025)
Water quality - Gross alpha and gross beta activity - Test method using liquid scintillation
counting (ISO/DIS 11704:2025)
Wasserbeschaffenheit - Gesamt-Alpha- und Gesamt-Beta-Aktivität - Verfahren mit dem
Flüssigszintillationszähler (ISO/DIS 11704:2025)
Qualité de l'eau - Activités alpha globale et bêta globale - Méthode d'essai par comptage
des scintillations en milieu liquide (ISO/DIS 11704:2025)
Ta slovenski standard je istoveten z: prEN ISO 11704
ICS:
13.060.60 Preiskava fizikalnih lastnosti Examination of physical
vode properties of water
17.240 Merjenje sevanja Radiation measurements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 11704
ISO/TC 147/SC 3
Water quality — Gross alpha and
Secretariat: AFNOR
gross beta activity — Test method
Voting begins on:
using liquid scintillation counting
2025-09-03
Qualité de l'eau — Activités alpha globale et bêta globale —
Voting terminates on:
Méthode d'essai par comptage des scintillations en milieu liquide
2025-11-26
ICS: 13.060.60; 17.240
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 has not been edited by the ISO Central Secretariat.
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Reference number
ISO/DIS 11704:2025(en)
DRAFT
ISO/DIS 11704:2025(en)
International
Standard
ISO/DIS 11704
ISO/TC 147/SC 3
Water quality — Gross alpha and
Secretariat: AFNOR
gross beta activity — Test method
Voting begins on:
using liquid scintillation counting
Qualité de l'eau — Activités alpha globale et bêta globale —
Voting terminates on:
Méthode d'essai par comptage des scintillations en milieu liquide
ICS: 13.060.60; 17.240
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 has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
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Published in Switzerland Reference number
ISO/DIS 11704:2025(en)
ii
ISO/DIS 11704:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and units . 2
4 Principle . 3
5 Sampling . 4
6 Chemical reagents and equipment . 4
6.1 Chemical reagents .4
6.2 Certified reference solutions. .5
6.2.1 General .5
6.2.2 Alpha emitting certified reference solution .5
6.2.3 Beta emitting certified reference solution .5
6.3 Equipment .5
7 Procedure . 6
7.1 Direct counting .6
7.2 Thermal preconcentration .6
7.3 Sample preparation .6
7.4 Liquid scintillation measurement .7
7.4.1 Preparation of alpha and beta calibration sources.7
7.4.2 Optimization of counting conditions .7
7.4.3 Blank sample preparation and measurement .8
7.4.4 Alpha and beta efficiencies .8
7.4.5 Sample measurement .8
8 Expression of results . 9
8.1 Calculation of activity per mass .9
8.2 Standard uncertainty .9
8.3 Decision threshold .11
8.4 Detection limit .11
8.5 Limits of the coverage intervals . 12
8.5.1 Limits of the probabilistically symmetric coverage interval . 12
8.5.2 The shortest coverage interval . 12
9 Quality control .13
10 Interference control .13
10.1 Contamination . 13
10.2 Ingrowth of radon. 13
10.3 Loss of polonium . 13
11 Test report .13
Annex A (informative) Set-up parameters and validation data .15
Annex B (informative) Method performances under different conditions .18
Bibliography . 19
iii
ISO/DIS 11704:2025(en)
Foreword
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