SIST EN ISO 19361:2025
(Main)Measurement of radioactivity - Determination of beta emitters activities -Test method using liquid scintillation counting (ISO 19361:2025)
Measurement of radioactivity - Determination of beta emitters activities -Test method using liquid scintillation counting (ISO 19361:2025)
This document applies to the determination of beta emitters activity concentration using liquid scintillation counting. The method requires the preparation of a scintillation source, which is obtained by mixing the test sample and a scintillation cocktail. The test sample can be liquid (aqueous or organic), or solid (particles or filter or planchet).
NOTE Planchet are samples, described in 8.5, out of solid material e.g. small metal, plastic or glass pans or support material made of these materials
This document describes the conditions for measuring the activity concentration of beta emitter radionuclides by liquid scintillation counting[2].
The choice of the test method using liquid scintillation counting involves the consideration of the potential presence of other beta-, alpha- and gamma emitter radionuclides in the test sample. In this case, a specific sample treatment by separation or extraction is implemented to isolate the radionuclide of interest in order to avoid any interference with other beta-, alpha- and gamma-emitting radionuclides during the counting phase.
This document is applicable to all types of liquid samples having an activity concentration ranging from about 1 Bq·l−1 to 106 Bq·l−1. For a liquid test sample, it is possible to dilute liquid test samples in order to obtain a solution having an activity compatible with the measuring instrument. For solid samples, the activity of the prepared scintillation source shall be compatible with the measuring instrument.
The measurement range is related to the test method used: nature of test portion, preparation of the scintillator - test portion mixture, measuring assembly as well as to the presence of the co-existing activities due to interfering radionuclides.
Test portion preparations (such as distillation for 3H measurement, or benzene synthesis for 14C measurement, etc.) are outside the scope of this document and are described in specific test methods using liquid scintillation[3][[4][5][6][7][8][9][10].
Mesurage de la radioactivité - Détermination de l'activité des radionucléides émetteurs bêta - Méthode d'essai par comptage des scintillations en milieu liquide (ISO 19361:2025)
Le présent document s’applique à la détermination de l’activité volumique des émetteurs bêta par comptage des scintillations en milieu liquide. La méthode requiert la préparation d’une source scintillante, obtenue en mélangeant la prise d’essai et un cocktail scintillant. La prise d’essai peut être liquide (aqueuse ou organique) ou solide (particules, filtre ou coupelle).
NOTE Ces coupelles constituent des échantillons et sont décrites en 8.5. Elles sont fabriquées à partir d’un matériau solide comme du métal, du plastique ou du verre ou à partir d’un support contenant ces matériaux.
Le présent document décrit les conditions de mesure de l’activité volumique de radionucléides émetteurs bêta par comptage des scintillations en milieu liquide[2].
Le choix de la méthode d’essai utilisant le comptage des scintillations en milieu liquide implique de prendre en compte la présence potentielle d’autres radionucléides émetteurs bêta, alpha et gamma dans la prise d’essai. Dans ce cas, un traitement spécifique de l’échantillon, par séparation ou extraction, est mis en place pour isoler le radionucléide d’intérêt afin d’éviter toute interférence avec d’autres radionucléides émetteurs bêta, alpha et gamma pendant la phase de comptage.
Le présent document s’applique à tous les types d’échantillons liquides ayant une activité volumique d’environ 1 Bq·l−1 à 106 Bq·l−1. Pour une prise d’essai liquide, il est possible de la diluer afin d’obtenir une solution ayant une activité compatible avec l’instrument de mesure. Pour les échantillons solides, l’activité de la source scintillante préparée doit être compatible avec l’instrument de mesure.
Le domaine de mesure est lié à la méthode d’essai utilisée: nature de la prise d’essai, préparation du mélange scintillant, prise d’essai, ensemble de mesure. Il est également lié à la présence d’autres radionucléides dont les activités interfèrent avec celle du radionucléide d’intérêt.
Les préparations de la prise d’essai (telles que la distillation pour le mesurage de 3H ou la synthèse du benzène pour le mesurage de 14C, etc.) ne font pas partie du domaine d’application du présent document et sont décrites dans des méthodes d’essai spécifiques utilisant la scintillation en milieu liquide[3][4][5][6][7][8][9][10].
Merjenje radioaktivnosti - Ugotavljanje aktivnosti oddajnikov beta - Preskusna metoda s tekočinskim scintilacijskim štetjem (ISO 19361:2025)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Merjenje radioaktivnosti - Ugotavljanje aktivnosti oddajnikov beta - Preskusna
metoda s tekočinskim scintilacijskim štetjem (ISO 19361:2025)
Measurement of radioactivity - Determination of beta emitters activities -Test method
using liquid scintillation counting (ISO 19361:2025)
Mesurage de la radioactivité - Détermination de l'activité des radionucléides émetteurs
bêta - Méthode d'essai par comptage des scintillations en milieu liquide (ISO
19361:2025)
Ta slovenski standard je istoveten z: EN ISO 19361:2025
ICS:
17.240 Merjenje sevanja Radiation measurements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 19361
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2025
EUROPÄISCHE NORM
ICS 17.240 Supersedes EN ISO 19361:2020
English Version
Measurement of radioactivity - Determination of beta
emitters activities -Test method using liquid scintillation
counting (ISO 19361:2025)
Mesurage de la radioactivité - Détermination de
l'activité des radionucléides émetteurs bêta - Méthode
d'essai par comptage des scintillations en milieu
liquide (ISO 19361:2025)
This European Standard was approved by CEN on 21 July 2025.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19361:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 19361:2025) has been prepared by Technical Committee ISO/TC 85 "Nuclear
energy, nuclear technologies, and radiological protection " in collaboration with Technical Committee
CEN/TC 430 “Nuclear energy, nuclear technologies, and radiological protection” the secretariat of
which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2026, and conflicting national standards shall
be withdrawn at the latest by January 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 19361:2020.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 19361:2025 has been approved by CEN as EN ISO 19361:2025 without any modification.
International
Standard
ISO 19361
Second edition
Measurement of radioactivity —
2025-07
Determination of beta emitters
activities — Test method using
liquid scintillation counting
Mesurage de la radioactivité — Détermination de l’activité des
radionucléides émetteurs bêta — Méthode d’essai par comptage
des scintillations en milieu liquide
Reference number
ISO 19361:2025(en) © ISO 2025
ISO 19361:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
ISO 19361:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions . 2
4 Symbols . 2
5 Principle . 3
6 Reagents and equipment . 3
6.1 Reagents .3
6.1.1 Blank material .3
6.1.2 Calibration source solutions .4
6.1.3 Scintillation cocktail .4
6.1.4 Quenching agent .4
6.2 Equipment .5
6.2.1 General .5
6.2.2 Liquid scintillation counter .5
6.2.3 Counting vials .5
7 Sampling and samples . . 5
7.1 Sampling .5
7.2 Sample storage .6
8 Procedure . 6
8.1 Determination of background .6
8.2 Determination of counting efficiency .6
8.3 Quench correction .6
8.4 Sample preparation .7
8.5 Preparation of the scintillation sources to be measured .7
8.6 Counting procedure .8
8.6.1 Control and calibration .8
8.6.2 Measurement conditions .8
8.6.3 Interference control . .8
9 Expression of results . 9
9.1 General .9
9.2 Calculation of activity concentration, without sample treatment prior to measurement .9
9.3 Decision threshold, without sample treatment prior to measurement .10
9.4 Detection limit, without sample treatment prior to measurement .10
9.5 Limit of coverage interval . .11
9.5.1 Limits of the probabilistically symmetric coverage interval .11
9.5.2 Limits of the shortest coverage interval .11
9.6 Calculations using the activity per unit of mass, without sample treatment prior to
measurement . 12
10 Test report .12
Annex A (informative) Internal standard method .13
Annex B (informative) TDCR liquid scintillation counting .
...
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