EN ISO 20045:2024

Measurement of the radioactivity in the environment - Air: tritium - Test method using bubbler sampling (ISO 20045:2023, including corrected version 2023-09)

This document describes a test method to determine the activity concentration of atmospheric tritium by trapping tritium in air by bubbling through a water solution.
The formulae are given for a sampling system with four bubblers. They can also be applied to trapping systems with only one trapping module consisting of two bubblers if only tritiated water vapour (HTO) is in the atmosphere to be sampled.
This document does not cover laboratory test sample results, in becquerel per litre of trapping solution, according to ISO 9698 or ISO 13168.
The test method detection limit result is between 0,2 Bq∙m-3 and 0,5 Bq∙m-3 when the sampling duration is about one week.

Bestimmung der Radioaktivität in der Umwelt - Luft: Tritium - Messverfahren mit Sammlung mittels Gaswaschflaschen (ISO 20045:2023, einschließlich der korrigierten Fassung von 2023-09)

Dieses Dokument beschreibt ein Prüfverfahren zur Bestimmung der Aktivitätskonzentration luftgetragenen Tri¬tiums durch Einfangen des Tritiums in einer in Gaswaschflaschen enthaltenen wässrigen Lösung. Akti-vitäts¬konzentrationen luftgetragenen Tritiums werden in Becquerel je Kubikmeter (Bqm–3) angegeben.
Die Gleichungen sind für ein Probenahmesystem mit vier Gaswaschflaschen angegeben. Sie können auch für Sammler mit nur einer Sammeleinheit aus zwei Gaswaschflaschen angewendet werden, wenn nur tritiierter Wasserdampf (HTO) aus der Luft gesammelt werden soll.
Dieses Dokument behandelt nicht Ergebnisse von Laborproben in Becquerel je Liter der Rückhaltelösung nach ISO 9698 oder ISO 13168.
Die Nachweisgrenze des Prüfverfahrens liegt zwischen 0,2 Bqm–3 und 0,5 Bqm–3 bei einer Probenahme-dauer von etwa 1 Woche.

Mesurage de la radioactivité dans l’environnement - Air : tritium - Méthode d’essai à l’aide d’un prélèvement par barbotage (ISO 20045:2023, y compris version corrigée 2023-09)

Merjenje radioaktivnosti v okolju - Zrak: tritij - Preskusna metoda z vzorčenjem z mehurčki (ISO 20045:2023, vključno s popravljeno različico 2023-09)

Ta dokument opisuje preskusno metodo za določanje koncentracije aktivnosti atmosferskega tritija z lovljenjem tritija v zraku z ustvarjanjem mehurčkov v raztopini vode.
Formule so podane za sistem vzorčenja s štirimi enotami za ustvarjanje mehurčkov. Uporabiti jih je mogoče tudi za sisteme lovljenja z enim samim lovilnim modulom, ki vključuje dve enoti za ustvarjanje mehurčkov, če je v atmosferi za vzorčenje prisotna samo tritirana vodna para (HTO).
Ta dokument ne zajema rezultatov laboratorijskih preskusnih vzorcev, v bekerelih na liter raztopine za lovljenje, v skladu s standardom ISO 9698 oziroma ISO 13168.
Rezultat mejne vrednosti zaznavanja preskusne metode je med 0,2 Bq∙m-3 in 0,5 Bq∙m-3, če vzorčenje traja približno en teden.

General Information

• Status: Published
• Publication Date: 16-Jul-2024
• ICS: 13.040.01 - Air quality in general
• ICS: 17.240 - Radiation measurements
• Technical Committee: CEN/TC 430 - Nuclear energy, nuclear technologies, and radiological protection
• Drafting Committee: CEN/TC 430 - Nuclear energy, nuclear technologies, and radiological protection
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 17-Jul-2024
• Due Date: 18-Apr-2026
• Completion Date: 17-Jul-2024
• Ref Project: SIST EN ISO 20045:2024 - Measurement of the radioactivity in the environment - Air: tritium - Test method using bubbler sampling (ISO 20045:2023, vključno s popravljeno različico 2023-09)

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2024
Merjenje radioaktivnosti v okolju - Zrak: tritij - Preskusna metoda z vzorčenjem z
mehurčki (ISO 20045:2023, vključno s popravljeno različico 2023-09)
Measurement of the radioactivity in the environment - Air: tritium - Test method using
bubbler sampling (ISO 20045:2023, vključno s popravljeno različico 2023-09)
Bestimmung der Radioaktivität in der Umwelt - Luft: Tritium - Messverfahren mit
Sammlung mittels Gaswaschflaschen (ISO 20045:2023, vključno s popravljeno različico
2023-09)
Mesurage de la radioactivité dans l’environnement - Air : tritium - Méthode d’essai à
l’aide d’un prélèvement par barbotage (ISO 20045:2023, vključno s popravljeno različico
2023-09)
Ta slovenski standard je istoveten z: EN ISO 20045:2024
ICS:
13.040.01 Kakovost zraka na splošno Air quality in general
17.240 Merjenje sevanja Radiation measurements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20045
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2024
EUROPÄISCHE NORM
ICS 13.040.01; 17.240
English Version
Measurement of the radioactivity in the environment - Air:
tritium - Test method using bubbler sampling (ISO
20045:2023, including corrected version 2023-09)
Mesurage de la radioactivité dans l'environnement - Bestimmung der Radioaktivität in der Umwelt - Luft:
Air : tritium - Méthode d'essai à l'aide d'un Tritium - Messverfahren mit Sammlung mittels
prélèvement par barbotage (ISO 20045:2023, y Gaswaschflaschen (ISO 20045:2023, einschließlich der
compris version corrigée 2023-09) korrigierten Fassung von 2023-09)
This European Standard was approved by CEN on 7 July 2024.

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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20045:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 20045:2023, including corrected version 2023-09 has been prepared by Technical
Committee ISO/TC 85 “Nuclear energy, nuclear technologies, and radiological protection” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 20045:2024 by
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 2025, and conflicting national standards shall
be withdrawn at the latest by January 2025.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
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 20045:2023, including corrected version 2023-09 has been approved by CEN as
INTERNATIONAL ISO
STANDARD 20045
First edition
2023-05
Corrected version
2023-09
Measurement of the radioactivity in
the environment — Air: tritium — Test
method using bubbler sampling
Mesurage de la radioactivité dans l’environnement — Air : tritium —
Méthode d’essai à l’aide d’un prélèvement par barbotage
Reference number
ISO 20045:2023(E)
ISO 20045:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 20045:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions . 2
3.2 Symbols, definitions and units . 3
4 Principle . 4
5 Influence quantities . 5
6 Equipment . 6
6.1 Description and requirements of the sampling system . 6
6.2 Location of sampling head . 6
6.3 Air flow rate, sampling duration and air volume sampling . 6
6.4 Trapping water solution . 7
6.5 Specifications for use . 7
7 Procedure .8
7.1 Sampling . 8
7.2 Sample collection and transportation . 9
7.3 Receipt. 9
7.4 Conservation . 9
7.5 Tritium activity concentration measurement . 9
8 Expression of results . 9
8.1 General . 9
8.2 Calculations for tritiated water vapour . 10
8.2.1 Activity concentration . . 10
8.2.2 Decision threshold . 10
8.2.3 Detection limit . 11
8.2.4 Coverage intervals limits . 11
8.2.5 Conditions of use .12
8.3 Calculation for tritiated gas compounds .12
8.3.1 Tritiated gas without significant HTO level .13
8.3.2 Tritiated gas compounds with significant HTO level . 14
8.3.3 Coverage intervals limits . 16
8.3.4 Conditions of use . 16
9 Test report .17
Annex A (informative) Technical data for tritium .19
Annex B (informative) Determination of trapping efficiency .21
Annex C (informative) Preserving of tritiated water solutions .25
Annex D (informative) Example of sampling and calculations forms .26
Annex E (informative) Examples of calculations of air tritium activity concentrations .29
Bibliography .35
iii
ISO 20045:2023(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is
...