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 11665-1:2019)

This document outlines guidance for measuring radon-222 activity concentration and the potential alpha energy concentration of its short-lived decay products in the air.
The measurement methods fall into three categories:
a)    spot measurement methods;
b)    continuous measurement methods;
c)    integrated measurement methods.
This document provides several methods commonly used for measuring radon-222 and its short-lived decay products in air.
This document also provides guidance on the determination of the inherent uncertainty linked to the measurement methods described in its different parts.

Ermittlung der Radioaktivität in der Umwelt - Luft: Radon-222 - Teil 1: Radon und seine kurzlebigen Folgeprodukte: Quellen und Messverfahren (ISO 11665-1:2019)

Dieses Dokument ist ein Leitfaden für Messungen der 222Rn-Aktivitätskonzentration und der potenziellen Alpha-Energiekonzentration seiner kurzlebigen Folgeprodukte in der Luft.
Die Messverfahren werden in drei Kategorien eingeteilt:
a) Punktmessverfahren;
b) kontinuierliche Messverfahren;
c) integrierende Messverfahren.
Dieses Dokument stellt verschiedene Verfahren bereit, die im Allgemeinen zur Messung von 222Rn und sei-ner kurzlebigen Folgeprodukte in der Luft angewendet werden.
Dieses Dokument gibt auch eine Anleitung zur Bestimmung der Eigenmessunsicherheit für die in den ver-schiedenen Teilen dieser Norm beschriebenen Messverfahren.

Mesurage de la radioactivité dans l'environnement - Air: radon 222 - Partie 1: Origine du radon et de ses descendants à vie courte, et méthodes de mesure associées (ISO 11665-1:2019)

Le présent document présente les recommandations pour le mesurage de l'activité volumique du radon 222 et de l'énergie alpha potentielle volumique de ses descendants à vie courte dans l'air.
Les méthodes de mesure se divisent en trois catégories:
a)    méthodes de mesure ponctuelle;
b)    méthodes de mesure en continu;
c)    méthodes de mesure intégrée.
Le présent document fournit plusieurs méthodes couramment utilisées pour le mesurage du radon 222 et de ses descendants à vie courte dans l'air.
Le présent document fournit également des recommandations relatives à la détermination de l'incertitude relative aux méthodes de mesure décrites dans ses diverses parties.

Merjenje radioaktivnosti v okolju - Zrak: radon Rn-222 - 1. del: Radon in njegovi kratkoživi razpadni produkti: izvori in merilne metode (ISO 11665-1:2019)

Standard ISO 11665-1 navaja smernice za merjenje koncentracije aktivnosti radona-222 in potencialne koncentracije alfa energije njegovih kratkoživih razpadnih produktov v zraku. Metode merjenja se razvrščajo v tri kategorije: a) metode točkovnega merjenja; b) metode neprekinjenega merjenja; c) metode integriranega merjenja. Ta dokument določa več metod, ki se običajno uporabljajo za merjenje radona-222 in njegovih kratkoživih razpadnih produktov v zraku. Ta dokument določa tudi smernice za ugotavljanje temeljne negotovosti v povezavi z merilnimi metodami, opisanimi v različnih delih tega standarda.

General Information

Status
Published
Publication Date
08-Oct-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
09-Oct-2019
Completion Date
09-Oct-2019

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SLOVENSKI STANDARD
SIST EN ISO 11665-1:2019
01-december-2019
Nadomešča:
SIST EN ISO 11665-1:2015

Merjenje radioaktivnosti v okolju - Zrak: radon Rn-222 - 1. del: Radon in njegovi

kratkoživi razpadni produkti: izvori in merilne metode (ISO 11665-1:2019)

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
11665-1:2019)

Ermittlung der Radioaktivität in der Umwelt - Luft: Radon-222 - Teil 1: Radon und seine

kurzlebigen Folgeprodukte: Quellen und Messverfahren (ISO 11665-1:2019)

Mesurage de la radioactivité dans l'environnement - Air: radon 222 - Partie 1: Origine du

radon et de ses descendants à vie courte, et méthodes de mesure associées (ISO
11665-1:2019)
Ta slovenski standard je istoveten z: EN ISO 11665-1:2019
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 11665-1:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11665-1:2019
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SIST EN ISO 11665-1:2019
EN ISO 11665-1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 13.040.01; 17.240 Supersedes EN ISO 11665-1:2015
English Version
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 11665-1:2019)

Mesurage de la radioactivité dans l'environnement - Ermittlung der Radioaktivität in der Umwelt - Luft:

Air: radon 222 - Partie 1: Origine du radon et de ses Radon-222 - Teil 1: Radon und seine kurzlebigen

descendants à vie courte, et méthodes de mesure Folgeprodukte: Quellen und Messverfahren (ISO

associées (ISO 11665-1:2019) 11665-1:2019)
This European Standard was approved by CEN on 6 September 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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11665-1:2019 E

worldwide for CEN national Members.
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SIST EN ISO 11665-1:2019
EN ISO 11665-1:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 11665-1:2019
EN ISO 11665-1:2019 (E)
European foreword

This document (EN ISO 11665-1:2019) 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 April 2020, and conflicting national standards shall be

withdrawn at the latest by April 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.

This document supersedes EN ISO 11665-1:2015.

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 11665-1:2019 has been approved by CEN as EN ISO 11665-1:2019 without any

modification.
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SIST EN ISO 11665-1:2019
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SIST EN ISO 11665-1:2019
INTERNATIONAL ISO
STANDARD 11665-1
Second edition
2019-09
Measurement of radioactivity in the
environment — Air: radon-222 —
Part 1:
Origins of radon and its short-lived
decay products and associated
measurement methods
Mesurage de la radioactivité dans l'environnement — Air: radon 222 —
Partie 1: Origine du radon et de ses descendants à vie courte, et
méthodes de mesure associées
Reference number
ISO 11665-1:2019(E)
ISO 2019
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SIST EN ISO 11665-1:2019
ISO 11665-1:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 11665-1:2019
ISO 11665-1:2019(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 ......................................................................................................................................................................................................... 8

4 Principle .....................................................................................................................................................................................................................10

5 Equipment ................................................................................................................................................................................................................10

6 Sampling .....................................................................................................................................................................................................................10

6.1 General ........................................................................................................................................................................................................10

6.2 Sampling objective ............................................................................................................................................................................11

6.3 Sampling characteristics ......... .....................................................................................................................................................11

6.4 Sampling conditions ........................................................................................................................................................................11

6.4.1 Installation of sampling device .........................................................................................................................11

6.4.2 Sampling duration .......................................................................................................................................................12

6.4.3 Volume of air sampled .................. ......................................................................................................................... ...13

7 Detection ....................................................................................................................................................................................................................13

7.1 Silver-activated zinc sulphide ZnS(Ag) scintillation ............................................................................................13

7.2 Gamma-ray spectrometry...........................................................................................................................................................13

7.3 Liquid scintillation ............................................................................................................................................................................13

7.4 Air ionization .........................................................................................................................................................................................14

7.5 Semi-conductor (alpha detection) ......................................................................................................................................14

7.6 Solid-state nuclear track detectors (SSNTD) .............................................................................................................14

7.7 Discharge of polarised surface inside an ionization chamber ....................................................................14

8 Measurement ........................................................................................................................................................................................................14

8.1 Methods ......................................................................................................................................................................................................14

8.2 Influence quantities .........................................................................................................................................................................15

8.3 Calibration ...............................................................................................................................................................................................16

8.4 Quality control ......................................................................................................................................................................................16

9 Expression of results .....................................................................................................................................................................................16

10 Test report ................................................................................................................................................................................................................16

Annex A (informative) Radon and its decay products — General information .....................................................18

Annex B (informative) Example of results of spot, integrated and continuous

measurements of radon-222 activity concentration ...................................................................................................28

Annex C (informative) Example of a test report .....................................................................................................................................30

Bibliography .............................................................................................................................................................................................................................31

© ISO 2019 – All rights reserved iii
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SIST EN ISO 11665-1:2019
ISO 11665-1:2019(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.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 85, Nuclear energy, nuclear technologies,

and radiological protection, Subcommittee SC 2, Radiological protection.

This second edition cancels and replaces the first edition (ISO 11665-1:2012), of which it constitutes a

minor revision. The changes compared to the previous edition are as follows:
— update of the Introduction;

— in A.2.4, details added for change in radon activities concentration in time and space in buildings;

— update of the Bibliography.
A list of all the parts in the ISO 11665 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
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SIST EN ISO 11665-1:2019
ISO 11665-1:2019(E)
Introduction

Radon isotopes 222, 219 and 220 are radioactive gases produced by the disintegration of radium

isotopes 226, 223 and 224, which are decay products of uranium-238, uranium-235 and thorium-232

respectively, and are all found in the earth's crust (see Annex A for further information). Solid elements,

[1]
also radioactive, followed by stable lead are produced by radon 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

[2][3][4][5]
according to their size .
[6]

Radon is today considered to be the main source of human exposure to natural radiation. UNSCEAR

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 (see Annex A). For this reason, references to radon

in this document refer only to radon-222.

Radon activity concentration can vary from one to more orders of magnitude over time and space.

Exposure to radon and its decay products varies tremendously from one area to another, as it depends

on the amount of radon emitted by the soil and building materials, weather conditions, and on the

degree of containment in the areas where individuals are exposed.

As radon tends to concentrate in enclosed spaces like houses, the main part of the population exposure

is due to indoor radon. Soil gas is recognized as the most important source of residential radon through

infiltration pathways. Other sources are described in other parts of ISO 11665 and ISO 13164 series for

[59]
water .

Radon enters into buildings via diffusion mechanism caused by the all-time existing difference between

radon activity concentrations in the underlying soil and inside the building, and via convection

mechanism inconstantly generated by a difference in pressure between the air in the building and the

air contained in the underlying soil. Indoor radon activity concentration depends on radon activity

concentration in the underlying soil, the building structure, the equipment (chimney, ventilation

systems, among others), the environmental parameters of the building (temperature, pressure, etc.)

and the occupants’ lifestyle.

To limit the risk to individuals, a national reference level of 100 Bq·m is recommended by the World

[5] -3

Health Organization . Wherever this is not possible, this reference level should not exceed 300 Bq·m .

This recommendation was endorsed by the European Community Member States that shall establish

national reference levels for indoor radon activity concentrations. The reference levels for the annual

-3[5]
average activity concentration in air shall not be higher than 300 Bq·m .

To reduce the risk to the overall population, building codes should be implemented that require radon

prevention measures in buildings under construction and radon mitigating measures in existing

buildings. Radon measurements are needed because building codes alone cannot guarantee that radon

concentrations are below the reference level.
ISO 11665 consists of several parts (see Figure 1) dealing with:

— measurement methods for radon-222 and its short-lived decay products (see ISO 11665-2,

ISO 11665-3, ISO 11665-4, ISO 11665-5 and ISO 11665-6);

NOTE 1 There are many methods for measuring the radon-222 activity concentration and the potential

alpha energy concentration of its short-lived decay products. The choice of measurement method depends

on the expected level of concentration and on the intended use of the data, such as scientific research and

[8][9]
health-related assessments .

— measurement methods for the radon-222 exhalation rate (see ISO 11665-7 and ISO 11665-9);

© ISO 2019 – All rights reserved v
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SIST EN ISO 11665-1:2019
ISO 11665-1:2019(E)
NOTE 2 ISO 11665-7 refers back to ISO 11665-5 and ISO 11665-6.
— measurement methods for the radon-222 in the soil (see ISO 11665-11);
— methodologies for radon-222 measurements in buildings (see ISO 11665-8);

— measurement methods for the radon-222 diffusion coefficient (see ISO/TS 11665-12 and

ISO/TS 11665-13)

NOTE 3 ISO 11665-8 refers back to ISO 11665-4 for radon measurements for initial investigation

purposes in a building and to ISO 11665-5, ISO 11665-6 and ISO 11665-7 for measurements for any additional

investigation.
vi © ISO 2019 – All rights reserved
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SIST EN ISO 11665-1:2019
ISO 11665-1:2019(E)
Figure 1 — Structure of the ISO 11665 series
© ISO 2019 – All rights reserved vii
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SIST EN ISO 11665-1:2019
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SIST EN ISO 11665-1:2019
INTERNATIONAL STANDARD ISO 11665-1:2019(E)
Measurement of radioactivity in the environment — Air:
radon-222 —
Part 1:
Origins of radon and its short-lived decay products and
associated measurement methods
1 Scope

This document outlines guidance for measuring radon-222 activity concentration and the potential

alpha energy concentration of its short-lived decay products in the air.
The measurement methods fall into three categories:
a) spot measurement methods;
b) continuous measurement methods;
c) integrated measurement methods.

This document provides several methods commonly used for measuring radon-222 and its short-lived

decay products in air.

This document also provides guidance on the determination of the inherent uncertainty linked to the

measurement methods described in its different parts.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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/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

IEC 61577-2, Radiation protection instrumentation — Radon and radon decay product measuring

222 220
instruments — Part 2: Specific requirements for  Rn and Rn measuring instruments

IEC 61577-3, Radiation protection instrumentation — Radon and radon decay product measuring

instruments — Part 3: Specific requirements for radon decay product measuring instruments

3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at http: //www .iso .org/obp
© ISO 2019 – All rights reserved 1
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SIST EN ISO 11665-1:2019
ISO 11665-1:2019(E)
— IEC Electropedia: available at http: //www .electropedia .org/
3.1.1
active sampling
sampling using active devices like pumps for sampling the atmosphere
[SOURCE: IEC 61577-1:2006, 3.2.22]
3.1.2
activity
disintegration rate

number of spontaneous nuclear disintegrations occurring in a given quantity of material during a

suitably small interval of time divided by that interval of time

Note 1 to entry: Activity, A, is expressed by the relationship given in Formula (1):

A= λ⋅N
where
λ is the decay constant per second;
N is the number of atoms.

Note 2 to entry: The decay constant is linked to the radioactive half-life by the relationship:

ln 2
λ =
1/2
where
T is the radioactive half-life, in seconds.
1/2
3.1.3
activity concentration
activity per unit volume
[SOURCE: IEC 61577-1:2006, 3.1.2]
3.1.4
attached fraction

fraction of the potential alpha energy concentration of short-lived decay products that is attached to the

ambient aerosol
[SOURCE: IEC 61577-1:2006, 3.2.15, modified]

Note 1 to entry: The sizes of the carrier aerosol to which most of the short-lived decay products are attached are

generally in the 0,1 μm to 0,3 μm range of median values.
3.1.5
average activity concentration
exposure to activity concentration divided by the sampling duration
3.1.6
average potential alpha energy concentration

exposure to potential alpha energy concentration divided by the sampling duration

2 © ISO 2019 – All rights reserved
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SIST EN ISO 11665-1:2019
ISO 11665-1:2019(E)
3.1.7
background noise
signals caused by something other than the radiation to be detected

Note 1 to entry: A distinction can be made between signals caused by radiation from sources inside or outside the

detector other than those targeted for the measurements and signals caused by defects in the detection system

electronic circuits and their electrical power supply.
3.1.8
continuous measurement

measurement obtained by taking a sample continuously (or at integration intervals typically in range of

1 min to 120 min) with simultaneous or slightly delayed analysis

Note 1 to entry: The sampling duration shall be adapted to the dynamics of the phenomenon studied to monitor

the evolution of radon activity concentration over time.
Note 2 to entry: See Annex B for further information.
3.1.9
diffusion length
distance crossed by an atom due to diffusion forces before decaying

Note 1 to entry: Diffusion length, l, is expressed by the relationship given in Formula (3):

D 
 
 
where
D is the diffusion coefficient, in square metres per second;
λ is the decay constant per second.
3.1.10
equilibrium factor

ratio of the potential alpha energy concentration of short-lived radon decay products in a given volume

of air to the potential alpha energy concentration of these decay products if these are in radioactive

equilibrium with radon in the same volume of air
222

Note 1 to entry: The short-lived Rn decay products present in an atmosphere are very rarely in radioactive

equilibrium with their parent (through being trapped on the walls or eliminated by an air renewal system, for

example) and the equilibrium factor is used to qualify this state of "non-equilibrium".

Note 2 to entry: The equilibrium factor is between 0 and 1. The equilibrium factor in buildings typically varies

[4][6]
between 0,1 and 0,9, with an average value equal to 0,4 .
Note 3 to entry: The equilibrium factor, F , is expressed by Formula (4):
PAEC,222
F =
5,57⋅×10 C
222
where
222
is the potential alpha energy concentration of Rn, in joules per cubic metre;
PAEC,222
222 222

is the potential alpha energy concentration of the short-lived Rn decay products for 1 Bq of Rn

5,57×10 in equilibrium with its short-lived decay products, in joules per becquerel;

222
is the activity concentration of Rn, in becquerels per cubic metre.
222
© ISO 2019 – All rights reserved 3
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SIST EN ISO 11665-1:2019
ISO 11665-1:2019(E)
3.1.11
grab sampling

collection of a sample (i.e of air containing radon or aerosol particles) during a period considered short

compared with the fluctuations of the quantity under study (i.e volume activity of air)

[SOURCE: IEC 61577-1:2006, 3.2.18]
3.1.12
guideline value

value which corresponds to scientific, legal or other requirements with regard to the detection

capability and which is intended to be assessed by the measurement procedure by comparison with the

detection limit

Note 1 to entry: The guideline value can be given, for example, as an activity, a specific activity or an activity

concentration, a surface activity or a dose rate.

Note 2 to entry: The comparison of the detection limit with a guideline value allows a decision on whether or not

the measurement procedure satisfies the requirements set forth by the guideline value and is therefore suitable

for the intended measurement purpose. The measurement procedure satisfies the requirement if the detection

limit is smaller than the guideline value.

Note 3 to entry: The guideline value shall not be confused with other values stipulated as conformity requests or

as regulatory limits.
[SOURCE: ISO 11929-2:2019, 3.18]
3.1.13
integrated measurement

measurement performed by continuous sampling of a volume of air which, over time, is accumulating

physical quantities (number of nuclear tracks, number of electric charges, etc.) linked to the disintegration

of radon and/or
...

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