SIST EN ISO 11665-6:2015

SLOVENSKI STANDARD
SIST EN ISO 11665-6:2015
01-november-2015
0HUMHQMHUDGLRDNWLYQRVWLYRNROMX=UDNUDGRQGHO7RþNRYQRPHUMHQMH
NRQFHQWUDFLMHDNWLYQRVWL,62
Measurement of radioactivity in the environment - Air: radon-222 - Part 6: Spot
measurement method of the activity concentration (ISO 11665-6:2012)
Ermittlung der Radioaktivität in der Umwelt - Luft: Radon-222 - Teil 6:
Punktmessverfahren für die Aktivitätskonzentration (ISO 11665-6:2012)
Mesurage de la radioactivité dans l'environnement - Air: radon 222 - Partie 6: Méthode
de mesure ponctuelle de l'activité volumique (ISO 11665-6:2012)
Ta slovenski standard je istoveten z: EN ISO 11665-6:2015
ICS:
13.040.99 Drugi standardi v zvezi s Other standards related to air
kakovostjo zraka quality
17.240 Merjenje sevanja Radiation measurements
SIST EN ISO 11665-6:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11665-6:2015

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SIST EN ISO 11665-6:2015


EN ISO 11665-6
EUROPEAN STANDARD

NORME EUROPÉENNE

September 2015
EUROPÄISCHE NORM
ICS 13.040.01; 17.240
English Version

Measurement of radioactivity in the environment - Air:
radon-222 - Part 6: Spot measurement method of the
activity concentration (ISO 11665-6:2012)
Mesurage de la radioactivité dans l'environnement - Ermittlung der Radioaktivität in der Umwelt - Luft:
Air: radon 222 - Partie 6: Méthode de mesure Radon-222 - Teil 6: Punktmessverfahren für die
ponctuelle de l'activité volumique (ISO 11665-6:2012) Aktivitätskonzentration (ISO 11665-6:2012)
This European Standard was approved by CEN on 12 June 2015.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N

EUROPÄISCHES KOMITEE FÜR N O RMU N G

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11665-6:2015 E
worldwide for CEN national Members.

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SIST EN ISO 11665-6:2015
EN ISO 11665-6:2015 (E)
Contents Page
European foreword . 3
2

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SIST EN ISO 11665-6:2015
EN ISO 11665-6:2015 (E)
European foreword
The text of ISO 11665-6:2012 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 11665-6:2015 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 March 2016, and conflicting national standards shall
be withdrawn at the latest by March 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] 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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 11665-6:2012 has been approved by CEN as EN ISO 11665-6:2015 without any
modification.
3

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SIST EN ISO 11665-6:2015

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SIST EN ISO 11665-6:2015
INTERNATIONAL ISO
STANDARD 11665-6
First edition
2012-07-15
Measurement of radioactivity in the
environment — Air: radon-222 —
Part 6:
Spot measurement method of the activity
concentration
Mesurage de la radioactivité dans l’environnement — Air: radon 222 —
Partie 6: Méthode de mesure ponctuelle de l’activité volumique
Reference number
ISO 11665-6:2012(E)
©
ISO 2012

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SIST EN ISO 11665-6:2015
ISO 11665-6:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

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SIST EN ISO 11665-6:2015
ISO 11665-6:2012(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 . 1
3.2 Symbols . 2
4 Principle . 2
5 Equipment . 2
6 Sampling . 3
6.1 Sampling objective . 3
6.2 Sampling characteristics . 3
6.3 Sampling conditions . 3
7 Detection . 3
8 Measurement . 4
8.1 Procedure . 4
8.2 Influence quantities . 4
8.3 Calibration . 4
9 Expression of results . 4
9.1 Radon activity concentration . 4
9.2 Standard uncertainty . 5
9.3 Decision threshold and detection limit . 5
9.4 Limits of the confidence interval . 5
10 Test report . 5
Annex A (informative) Measurement method using scintillation cells . 7
Bibliography .13
© ISO 2012 – All rights reserved iii

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SIST EN ISO 11665-6:2015
ISO 11665-6:2012(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 normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 11665-6 was prepared by Technical Committee ISO/TC 85, Nuclear energy, nuclear technologies, and
radiological protection, Subcommittee SC 2, Radiological protection.
ISO 11665 consists of the following parts, under the general title Measurement of radioactivity in the
environment — Air: radon-222:
— Part 1: Origins of radon and its short-lived decay products and associated measurement methods
— Part 2: Integrated measurement method for determining average potential alpha energy concentration of
its short-lived decay products
— Part 3: Spot measurement method of the potential alpha energy concentration of its short-lived decay products
— Part 4: Integrated measurement method for determining average activity concentration using passive
sampling and delayed analysis
— Part 5: Continuous measurement method of the activity concentration
— Part 6: Spot measurement method of the activity concentration
— Part 7: Accumulation method for estimating surface exhalation rate
— Part 8: Methodologies for initial and additional investigations in buildings
The following parts are under preparation:
— Part 9: Method for determining exhalation rate of dense building materials
— Part 10: Determination of diffusion coefficient in waterproof materials using activity concentration measurement
iv © ISO 2012 – All rights reserved

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SIST EN ISO 11665-6:2015
ISO 11665-6:2012(E)
Introduction
Radon isotopes 222, 220 and 219 are radioactive gases produced by the disintegration of radium isotopes 226,
224 and 223, which are decay products of uranium-238, thorium-232 and uranium-235 respectively, and are
all found in the earth’s crust. Solid elements, also radioactive, followed by stable lead are produced by radon
[1]
disintegration .
When disintegrating, radon emits alpha particles and generates solid decay products, which are also radioactive
(polonium, bismuth, lead, etc.). The potential effects on human health of radon lie in its solid decay products
rather than the gas itself. Whether or not they are attached to atmospheric aerosols, radon decay products can
be inhaled and deposited in the bronchopulmonary tree to varying depths according to their size.
Radon is today considered to be the main source of human exposure to natural radiation. The UNSCEAR (2006)
[2]
report suggests that, at the worldwide level, radon accounts for around 52 % of global average exposure to
natural radiation. The radiological impact of isotope 222 (48 %) is far more significant than isotope 220 (4 %),
while isotope 219 is considered negligible. For this reason, references to radon in this part of ISO 11665 refer
only to radon-222.
Radon activity concentration can vary by one to multiple orders of magnitude over time and space. Exposure
to radon and its decay products varies tremendously from one area to another, as it depends firstly on the
amount of radon emitted by the soil and the building materials in each area and, secondly, on the degree of
containment and weather conditions in the areas where individuals are exposed.
The values commonly found in the continental environment are usually between a few becquerels per cubic
metre and several thousand becquerels per cubic metre. Activity concentrations of one becquerel per cubic
metre or less can be observed in the oceanic environment. Radon activity concentrations inside houses may
[3]
vary from several tens of becquerels per cubic metre to several hundreds of becquerels per cubic metre .
Activity concentrations can reach several thousands of becquerels per cubic metre in very confined spaces.
The activity concentration of radon-222 in the atmosphere can be measured by spot, continuous and integrated
measurement methods with active or passive air sampling (see ISO 11665-1). This part of ISO 11665 deals with
radon-222 spot measurement methods.
NOTE The origin of radon-222 and its short-lived decay products in the atmospheric environment and other
measurement methods are described generally in ISO 11665-1.
© ISO 2012 – All rights reserved v

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SIST EN ISO 11665-6:2015

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SIST EN ISO 11665-6:2015
INTERNATIONAL STANDARD ISO 11665-6:2012(E)
Measurement of radioactivity in the environment — Air:
radon-222 —
Part 6:
Spot measurement method of the activity concentration
1 Scope
This part of ISO 11665 describes radon-222 spot measurement methods. It gives indications for carrying out
spot measurements, at the scale of a few minutes at a given place, of the radon activity concentration in open
and confined atmospheres.
This measurement method is intended for rapid assessment of the radon activity concentration in the air.
The result cannot be extrapolated to an annual estimate of the radon activity concentration. This type of
measurement is therefore not applicable for assessment of the annual exposure.
The measurement method described is applicable to air samples with radon activity concentration greater
3
than 50 Bq/m .
NOTE For example, using an appropriate device, the radon activity concentration can be spot measured in the soil
and at the interface of a material with the atmosphere (see also ISO 11665-7).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 11665-1, Measurement of radioactivity in the environment — Air: radon-222 — Part 1: Origins of radon and
its short-lived decay products and associated measurement methods
ISO 11929, Determination of the characteristic limits (decision threshold, detection limit and limits of the
confidence interval) for measurements of ionizing radiation — Fundamentals and application
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
IEC 61577-1, Radiation protection instrumentation — Radon and radon decay product measuring instruments —
Part 1: General principles
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11665-1 apply.
© ISO 2012 – All rights reserved 1

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SIST EN ISO 11665-6:2015
ISO 11665-6:2012(E)
3.2 Symbols
For the purposes of this document, the symbols given in ISO 11665-1 and the following apply.
C
activity concentration, in becquerels per cubic metre
∗
decision threshold of the activity concentration, in becquerels per cubic metre
C
#
detection limit of the activity concentration, in becquerels per cubic metre
C

lower limit of the confidence interval of the activity concentration, in becquerels per cubic metre
C

upper limit of the confidence interval of the activity concentration, in becquerels per cubic metre
C
U
expanded uncertainty calculated by Uk=⋅u with k = 2
()
standard uncertainty associated with the measurement result
u
()
relative standard uncertainty
u ()
rel
µ
quantity to be measured
µ background level
0
ω correction factor linked to the calibration factor
4 Principle
Spot measurement of the radon activity concentration is based on the following elements:
a) active grab sampling of a volume of air previously filtered and representative of the atmosphere under
investigation at time t; this pre-filtered sample is introduced into the detection chamber;
b) measurement of the physical variable (photons, pulse counts and amplitude, etc.) linked to the radiation
that is emitted by the radon and/or its decay products present in the detection chamber after sampling.
Several measurement methods meet the requirements of this part of ISO 11665. They are basically distinguished
by the type of physical quantity and how it is measured. The physical quantity and its related measurement may
be as follows, for example:
— photons emitted by a scintillating medium, such as ZnS(Ag), when excited b
...