prEN ISO 19361
(Main)Measurement of radioactivity - Determination of beta emitters activities -Test method using liquid scintillation counting (ISO/DIS 19361:2024)
Measurement of radioactivity - Determination of beta emitters activities -Test method using liquid scintillation counting (ISO/DIS 19361:2024)
ISO 19361:2017 applies to liquid scintillation counters and requires the preparation of a scintillation source 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).
ISO 19361:2017describes the conditions for measuring the activity of beta emitter radionuclides by liquid scintillation counting[14][15].
The choice of the test method using liquid scintillation counting involves the consideration of the potential presence of other beta 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.
ISO 19361:2017 is applicable to all types of liquid samples having an activity concentration ranging from a few 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[2][3][4][5][6][7][8][9].
Mesurage de la radioactivité - Détermination de l'activité des radionucléides émetteurs bêta - Méthode d'essai par comptage des scintillations en milieu liquide (ISO/DIS 19361:2024)
ISO 19361:2017 s'applique aux compteurs à scintillations en milieu liquide et 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 (aqueux ou organique) ou solide (particules, filtre ou planchette).
ISO 19361:2017 décrit les conditions de mesure de l'activité de radionucléides émetteurs bêta par comptage des scintillations en milieu liquide[14][15].
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 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.
ISO 19361:2017 est applicable à tous les types d'échantillons liquides ayant une activité volumique de quelques Bq·l−1 à 106 Bq·l−1. Pour une prise d'essai liquide, il est possible de diluer les prises d'essai liquides 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'activités coexistantes dues à des radionucléides interférents.
Les préparations de la prise d'essai (telles que la distillation pour le mesurage du 3H ou la synthèse du benzène pour le mesurage du 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[2][3][4][5][6][7][8][9].
Merjenje radioaktivnosti - Ugotavljanje aktivnosti oddajnikov beta - Preskusna metoda s tekočinskim scintilacijskim štetjem (ISO/DIS 19361:2024)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2024
Merjenje radioaktivnosti - Ugotavljanje aktivnosti oddajnikov beta - Preskusna
metoda s tekočinskim scintilacijskim štetjem (ISO/DIS 19361:2024)
Measurement of radioactivity - Determination of beta emitters activities -Test method
using liquid scintillation counting (ISO/DIS 19361:2024)
Mesurage de la radioactivité - Détermination de l'activité des radionucléides émetteurs
bêta - Méthode d'essai par comptage des scintillations en milieu liquide (ISO/DIS
19361:2024)
Ta slovenski standard je istoveten z: prEN ISO 19361
ICS:
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 19361
ISO/TC 85/SC 2
Measurement of radioactivity —
Secretariat: AFNOR
Determination of beta emitters
Voting begins on:
activities — Test method using
2024-09-02
liquid scintillation counting
Voting terminates on:
2024-11-25
Mesurage de la radioactivité — Détermination de l'activité des
radionucléides émetteurs bêta — Méthode d'essai par comptage
des scintillations en milieu liquide
ICS: 17.240
THIS DOCUMENT IS A DRAFT CIRCULATED
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Reference number
ISO/DIS 19361:2024(en)
DRAFT
ISO/DIS 19361:2024(en)
International
Standard
ISO/DIS 19361
ISO/TC 85/SC 2
Measurement of radioactivity —
Secretariat: AFNOR
Determination of beta emitters
Voting begins on:
activities — Test method using
liquid scintillation counting
Voting terminates on:
Mesurage de la radioactivité — Détermination de l'activité des
radionucléides émetteurs bêta — Méthode d'essai par comptage
des scintillations en milieu liquide
ICS: 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.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
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
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Published in Switzerland Reference number
ISO/DIS 19361:2024(en)
ii
ISO/DIS 19361:2024(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 solution .4
6.1.4 Quenching agent .4
6.2 Equipment .4
6.2.1 General .4
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 detection 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 .7
8.6.1 Control and calibration .7
8.6.2 Measurement conditions .7
8.6.3 Interference control . .8
9 Expression of results . 9
9.1 General .9
9.2 Calculation of activity concentration, without preparation .9
9.3 Decision threshold, without preparation.10
9.4 Detection limit, without preparation .10
9.5 Limit of coverage interval . .10
9.5.1 Limits of the probabilistically symmetric coverage interval .10
9.5.2 Limits of the shortest coverage interval .11
9.6 Calculations using the activity per unit of mass, without preparation .11
10 Test report .11
Annex A (informative) Internal standard method .13
Annex B (informative) TDCR Liquid Scintillation Counting .15
Annex C (informative) Cerenkov measurement with liquid scintillation and TDCR counter .18
Bibliography .20
iii
ISO/DIS 19361:2024(en)
Foreword
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