EN ISO 22908:2020

Water quality - Radium 226 and Radium 228 - Test method using liquid scintillation counting (ISO 22908:2020)

This document specifies the determination of radium-226 (226Ra) and radium-228 (228Ra) activity concentrations in drinking water samples by chemical separation of radium and its measurement using liquid scintillation counting.
Massic activity concentrations of 226Ra and 228Ra which can be measured by this test method utilizing currently available liquid scintillation counters go down to 0,01 Bq/kg for 226Ra and 0,06 Bq/kg for 228Ra for a 0,5 kg sample mass and a 1 h counting time in a low background liquid scintillation counter[8].
The test method can be used for the fast detection of contamination of drinking water by radium in emergency situations.

Wasserbeschaffenheit - Radium-226 und Radium-228 - Verfahren mit dem Flüssigszintillationszähler (ISO 22908:2020)

Dieses Dokument legt ein Verfahren zur Bestimmung der Aktivitätskonzentrationen von Radium 226 (226Ra) und Radium 228 (228Ra) in Trinkwasserproben durch chemische Abtrennung von Radium und seine Messung mit dem Flüssigszintillationszähler fest.
Mit diesem Prüfverfahren können mit derzeit erhältlichen Flüssigszintillationszählern massenbezogene Aktivitätskonzentrationen an 226Ra und 228Ra bis zu einer Untergrenze von 0,01 Bq/kg (226Ra) bzw. 0,06 Bq/kg (228Ra) bestimmt werden, wenn in einem Flüssigszintillationszähler mit niedrigem Nulleffekt 0,5 kg Probenmasse und eine Messdauer von 1 h verwendet werden [8].
Das Prüfverfahren kann für die Schnellerkennung der Kontamination von Trinkwasser mit Radium in Notfallsituationen verwendet werden.

Qualité de l'eau - Radium 226 et radium 228 - Méthode d'essai par comptage des scintillations en milieu liquide (ISO 22908:2020)

Le présent document explicite la détermination des activités volumiques du radium-226 (226Ra) et du radium-228 (228Ra) dans des échantillons d'eau potable par séparation chimique du radium et son mesurage par comptage des scintillations en milieu liquide.
Les activités massiques du 226Ra et du 228Ra, qui peuvent être mesurées par cette méthode d'essai à l'aide de compteurs à scintillations en milieu liquide actuellement disponibles, sont comprises entre 0,01 Bq/kg pour le 226Ra et 0,06 Bq/kg pour le 228Ra, pour une masse d'échantillon de 0,5 kg et un temps de comptage de 1 h dans un compteur à scintillations en milieu liquide faible bruit de fond[8].
La méthode d'essai peut être utilisée pour la détection rapide de la pollution de l'eau potable par le radium en situation d'urgence.

Kakovost vode - Radij Ra-226 in Ra-228 - Preskusna metoda s štetjem s tekočinskim scintilatorjem (ISO 22908:2020)

General Information

• Status: Published
• Publication Date: 04-Feb-2020
• Withdrawal Date: 30-Aug-2020
• ICS: 13.060.60 - Examination of physical properties of water
• ICS: 13.280 - Radiation protection
• ICS: 17.240 - Radiation measurements
• Technical Committee: CEN/TC 230 - Water analysis
• Drafting Committee: CEN/TC 230 - Water analysis
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 05-Feb-2020
• Completion Date: 05-Feb-2020
• Ref Project: SIST EN ISO 22908:2020 - Water quality - Radium 226 and Radium 228 - Test method using liquid scintillation counting (ISO 22908:2020)

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2020
Kakovost vode - Radij Ra-226 in Ra-228 - Preskusna metoda s štetjem s
tekočinskim scintilatorjem (ISO 22908:2020)
Water quality - Radium 226 and Radium 228 - Test method using liquid scintillation
counting (ISO 22908:2020)
Wasserbeschaffenheit - Radium-226 und Radium-228 - Verfahren mit dem
Flüssigszintillationszähler (ISO 22908:2020)
Qualité de l'eau - Radium 226 et radium 228 - Méthode d'essai par comptage des
scintillations en milieu liquide (ISO 22908:2020)
Ta slovenski standard je istoveten z: EN ISO 22908:2020
ICS:
13.060.50 Preiskava vode na kemične Examination of water for
snovi chemical substances
17.240 Merjenje sevanja Radiation measurements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 22908
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 13.060.60; 13.280; 17.240
English Version
Water quality - Radium 226 and Radium 228 - Test
method using liquid scintillation counting (ISO
22908:2020)
Qualité de l'eau - Radium 226 et radium 228 - Méthode Wasserbeschaffenheit - Radium-226 und Radium-228 -
d'essai par comptage des scintillations en milieu Verfahren mit dem Flüssigszintillationszähler (ISO
liquide (ISO 22908:2020) 22908:2020)
This European Standard was approved by CEN on 20 December 2019.

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, Turkey 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22908:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 22908:2020) has been prepared by Technical Committee ISO/TC 147 "Water
quality" in collaboration with Technical Committee CEN/TC 230 “Water analysis” the secretariat of
which is held by DIN.
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 August 2020, and conflicting national standards shall
be withdrawn at the latest by August 2020.
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.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 22908:2020 has been approved by CEN as EN ISO 22908:2020 without any modification.

INTERNATIONAL ISO
STANDARD 22908
First edition
2020-01
Water quality — Radium 226 and
Radium 228 — Test method using
liquid scintillation counting
Qualité de l'eau — Radium 226 et radium 228 — Méthode d'essai par
comptage des scintillations en milieu liquide
Reference number
ISO 22908:2020(E)
©
ISO 2020
ISO 22908:2020(E)
© ISO 2020
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.
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 22908:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and units . 1
3.1 Terms and definitions . 1
3.2 Symbols, definitions and units . 2
4 Principle . 3
5 Reagents and equipment . 3
5.1 Reagents. 3
5.2 Equipment . 4
6 Sampling . 5
7 Instrument set-up and calibration . 5
7.1 Optimization of counting conditions . 5
7.1.1 Preparation of sources . 5
7.1.2 Optimization process . 6
226 228
7.2 Counting efficiencies of Ra and Ra . 6
226 228
7.2.1 Preparation of Ra and Ra standard sources . 6
7.2.2 Determination of counting efficiencies . 6
7.3 Blank sample measurement . 7
8 Procedure. 7
8.1 General . 7
8.2 Separation of radium by precipitation . 7
8.3 Purification of radium . 8
8.4 Test sample preparation . 8
8.5 Measurement . 9
8.6 Chemical recovery . 9
8.6.1 General. 9
226 228
8.6.2 Preparation of a QC sample with known Ra and Ra activities . 9
8.6.3 Determination of overall counting efficiencies . 9
8.6.4 Determination of chemical recovery . 9
9 Quality control .10
10 Expression of results .10
226 228
10.1 Calculation of massic activities of Ra and Ra at the sampling date .10
10.2 Standard uncertainty .10
10.3 Decision threshold .12
10.4 Detection limit .12
10.5 Confidence limits.12
11 Interference control .12
12 Test report .13
Annex A (informative) Flow chart of the procedure .14
Annex B (informative) Decay series relevant to radium isotopes .15
Annex C (informative) Set-up parameters and procedure .16
Annex D (informative) Validation data.22
Bibliography .28
ISO 22908:2020(E)
Foreword
ISO (the International Organization for Sta
...