Radiation protection instrumentation - Radon and radon decay product measuring instruments - Part 3: Specific requirements for radon decay product measuring instruments

IEC 61577-3:2011 describes the specific requirements for instruments measuring the volumetric activity of airborne short-lived radon decay products and/or their ambient potential alpha-energy concentration outdoors, in dwellings, and in workplaces including underground mines. This standard applies practically to all types of electronic instruments that are based on grab sampling, continuous sampling technique and electronic integrating measurement methods. This new edition includes the following significant technical changes with respect to the previous edition:
- implementation of new requirements and tests concerning radiation detection performance;
- implementation of new requirements and tests concerning environmental performance;
- harmonization of the requirements and tests concerning electrical and mechanical performance with other standards in the area of radiation protection instrumentation.

Strahlenschutz-Messgeräte - Geräte für die Messung von Radon und Radon-Folgeprodukten - Teil 3: Besondere Anforderungen an Messgeräte für Radonfolgeprodukte

Instrumentation pour la radioprotection - Instruments de mesure du radon et des descendants du radon - Partie 3: Exigences spécifiques concernant les instruments de mesure des descendants du radon

La CEI 61577-3:2011 décrit les exigences spécifiques relatives aux instruments destinés au mesurage de l'activité volumétrique des descendants du radon à vie courte en suspension dans l'air et/ou de leur énergie alpha potentielle volumique à l'extérieur, dans les habitations et sur les lieux de travail, y compris dans les mines souterraines. En pratique, la présente Norme s'applique à tous les types d'instruments électroniques utilisant des méthodes basées sur un prélèvement instantané, un prélèvement en continu et des méthodes de mesure électroniques intégrées. Cette nouvelle édition constitue une révision technique et inclut les changements techniques significatifs suivants par rapport à l'édition précédente:
- ajout de nouvelles exigences et de nouveaux essais concernant les performances de détection de rayonnement;
- ajout de nouvelles exigences et de nouveaux essais concernant les performances environnementales;
- harmonisation des exigences et des essais, concernant les performances électriques et mécaniques, avec d'autres normes du domaine de l'instrumentation pour la radioprotection.

Instrumenti za zaščito pred sevanjem - Instrumenti za merjenje radona in njegovih razpadnih produktov - 3. del: Posebne zahteve za instrumente za merjenje razpadnih produktov radona

Standard IEC 61577-3:2011 opisuje posebne zahteve za instrumente, ki merijo volumetrično dejavnost kratkotrajnih razpadnih produktov radona v zraku in/ali njihove okoljske potencialne koncentracije alfa energije na prostem, v stanovanjih ter na delovnih mestih, vključno s podzemnimi rudniki. Ta standard se uporablja za skoraj vse vrste elektronskih instrumentov, ki temeljijo na zajemnem vzorčenju, tehniki neprekinjenega vzorčenja in metodah elektronskega integrirnega merjenja. Ta nova izdaja vključuje naslednje znatne tehnične spremembe glede na prejšnjo izdajo:
– izvajanje novih zahtev in preskusov v zvezi z učinkovitostjo zaznavanja sevanja;
– izvajanje novih zahtev in preskusov v zvezi z okoljsko učinkovitostjo;
– usklajevanje zahtev in preskusov v zvezi z električno in mehansko učinkovitostjo z drugimi standardi na področju instrumentov za zaščito proti sevanju.

General Information

Status
Published
Publication Date
16-Aug-2015
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Feb-2015
Due Date
18-Apr-2015
Completion Date
17-Aug-2015

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SLOVENSKI STANDARD
SIST EN 61577-3:2015
01-september-2015

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UD]SDGQLKSURGXNWRYGHO3RVHEQH]DKWHYH]DLQVWUXPHQWH]DPHUMHQMH
UD]SDGQLKSURGXNWRYUDGRQD
Radiation protection instrumentation - Radon and radon decay product measuring
instruments - Part 3: Specific requirements for radon decay product measuring
instruments
Strahlenschutz-Messgeräte - Geräte für die Messung von Radon und Radon-
Folgeprodukten - Teil 3: Besondere Anforderungen an Messgeräte für
Radonfolgeprodukte
Instrumentation pour la radioprotection - Instruments de mesure du radon et des

descendants du radon - Partie 3: Exigences spécifiques concernant les instruments de

mesure des descendants du radon
Ta slovenski standard je istoveten z: EN 61577-3:2014
ICS:
13.280 Varstvo pred sevanjem Radiation protection
17.240 Merjenje sevanja Radiation measurements
SIST EN 61577-3:2015 en

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

---------------------- Page: 1 ----------------------
SIST EN 61577-3:2015
---------------------- Page: 2 ----------------------
SIST EN 61577-3:2015
EUROPEAN STANDARD EN 61577-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2014
ICS 13.280
English Version
Radiation protection instrumentation - Radon and radon decay
product measuring instruments - Part 3: Specific requirements
for radon decay product measuring instruments
(IEC 61577-3:2011 , modified)

Instrumentation pour la radioprotection - Instruments de Strahlenschutz-Messgeräte - Geräte für die Messung von

mesure du radon et des descendants du radon - Partie 3: Radon und Radon-Folgeprodukten - Teil 3: Besondere

Exigences spécifiques concernant les instruments de Anforderungen an Messgeräte für Radonfolgeprodukte

mesure des descendants du radon (IEC 61577-3:2011 , modifiziert)
(CEI 61577-3:2011 , modifiée)

This European Standard was approved by CENELEC on 2014-11-17. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 61577-3:2014 E
---------------------- Page: 3 ----------------------
SIST EN 61577-3:2015
EN 61577-3:2014 - 2 -
Foreword

This document (EN 61577-3:2014) consists of the text of IEC 61577-3:2011 prepared by IEC/SC 45B

"Radiation protection instrumentation" of IEC/TC 45 "Nuclear instrumentation", together with the

common modifications prepared by CLC/TC 45B "Radiation protection instrumentation".

The following dates are fixed:
(dop) 2015-11-17
• latest date by which this document has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dow) 2017-11-17
• latest date by which the national standards conflicting
with this document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
---------------------- Page: 4 ----------------------
SIST EN 61577-3:2015
- 3 - EN 61577-3:2014
Endorsement notice

The text of the International Standard IEC 61577-3:2011 was approved by CENELEC as a European

Standard with agreed common modifications.
COMMON MODIFICATIONS
2 Normative references
Add IEC 61577-1 and IEC 61577-4.
6 Test conditions
6.4 Test sources
6.4.2 Reference atmospheres
Replace in the second paragraph 150 nm with 100 nm.
9 Requirements and tests concerning environmental performance
9.2 Number concentration of aerosols
9.2.2 Test method
8 –3

Replace in the second paragraph “adjusted to 10 m with an accuracy of ± 10 %.” with

8 –3
“adjusted to about 10 m .”
10 –3 10 –3 12 –3

Replace in the third paragraph “10 m ” with “about 10 m ” and replace “10 m ” with

12 –3
“about 10 m ”
Table 1 – Reference conditions and standard test conditions
Replace the line for ambient temperature as follows:
Ambient temperature 20 °C 18 °C to 24 °C
Replace the line for relative humidity as follows:
Relative humidity 65 % 40 % to 75 %
Replace the line for ambient dose equivalent rate as follows:
Ambient dose
Negligible < 0,25 µSv⋅h
equivalent rate
---------------------- Page: 5 ----------------------
SIST EN 61577-3:2015
EN 61577-3:2014 - 4 -
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),

the relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is

available here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-394 - International Electrotechnical - -
Vocabulary (IEV) -
Part 394: Nuclear instrumentation -
Instruments, systems, equipment and
detectors
IEC 60068-2-27 - Environmental testing - EN 60068-2-27 -
Part 2-27: Tests - Test Ea and
guidance: Shock
IEC 61000-6-4 - Electromagnetic compatibility (EMC) - -
EN 61000-6-4
Part 6-4: Generic standards - Emission
standard for industrial environments
IEC 61140 - Protection against electric shock - -
EN 61140
Common aspects for installation and
equipment
IEC 61187 - Electrical and electronic measuring EN 61187 -
equipment - Documentation
IEC 61577-1 - Radiation protection instrumentation - - -
Radon and radon decay product
measuring instruments -
Part 1: General principles
IEC 61577-4 - Radiation protection instrumentation - EN 61577-4 -
Radon and radon decay product
measuring instruments -
Part 4: Equipment for the production of
reference atmospheres containing
radon isotopes and their decay products
(STAR)
ISO/IEC Guide 98-3 2008 Uncertainty of measurement - - -
Part 3: Guide to the expression of
uncertainty in measurement
(GUM:1995)
---------------------- Page: 6 ----------------------
SIST EN 61577-3:2015
IEC 61577-3
Edition 2.0 2011-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiation protection instrumentation – Radon and radon decay product
measuring instruments –
Part 3: Specific requirements for radon decay product measuring instruments
Instrumentation pour la radioprotection – Instruments de mesure du radon et
des descendants du radon –
Partie 3: Exigences spécifiques concernant les instruments de mesure des
descendants du radon
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 13.280 ISBN 978-2-88912-839-6
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 61577-3:2015
– 2 – 61577-3 © IEC:2011
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope ............................................................................................................................... 8

2 Normative references ....................................................................................................... 8

3 Terms and definitions ....................................................................................................... 8

4 General design considerations ....................................................................................... 10

4.1 Design considerations for the measurements ........................................................ 10

4.1.1 Deposition of radon decay products on surfaces ........................................ 10

4.1.2 Airflow system ........................................................................................... 11

4.2 Design considerations for handling and maintenance ............................................ 11

4.2.1 Portability .................................................................................................. 11

4.2.2 Application under heavy environmental conditions ..................................... 11

4.2.3 Automatic operation ................................................................................... 11

4.2.4 Reliability .................................................................................................. 11

4.2.5 Capability for operational testing ............................................................... 12

4.2.6 Adjustment and maintenance facilities ....................................................... 12

4.2.7 Acoustic noise level ................................................................................... 12

4.2.8 Electromagnetic interference ..................................................................... 12

4.2.9 Storage ..................................................................................................... 12

5 Technical components .................................................................................................... 12

5.1 Sampling assembly ............................................................................................... 12

5.2 Radiation detection assembly ................................................................................ 13

5.3 Data processing and recording .............................................................................. 13

5.4 Measurement display ............................................................................................ 13

5.5 Power supply ......................................................................................................... 14

6 Test conditions ............................................................................................................... 14

6.1 General ................................................................................................................. 14

6.2 Standard test conditions ........................................................................................ 15

6.3 Execution of tests .................................................................................................. 15

6.4 Test sources ......................................................................................................... 15

6.4.1 Solid sources ............................................................................................. 15

6.4.2 Reference atmospheres ............................................................................. 15

7 Requirements and tests concerning radiation detection performance .............................. 16

7.1 Reference response to a test source ..................................................................... 16

7.1.1 Requirements ............................................................................................ 16

7.1.2 Test method .............................................................................................. 16

7.2 Cross interference to other radon isotopes ............................................................ 16

7.2.1 Requirements ............................................................................................ 16

7.2.2 Test method .............................................................................................. 16

7.3 Linearity of indication ............................................................................................ 17

7.3.1 Requirements ............................................................................................ 17

7.3.2 Test method .............................................................................................. 17

7.4 Instrument statistical fluctuation ............................................................................ 17

7.4.1 Requirements ............................................................................................ 17

7.4.2 Test method .............................................................................................. 17

7.5 Response time ...................................................................................................... 18

---------------------- Page: 8 ----------------------
SIST EN 61577-3:2015
61577-3 © IEC:2011 – 3 –

7.5.1 Requirements ............................................................................................ 18

7.5.2 Test method .............................................................................................. 18

7.6 Signal accumulation .............................................................................................. 18

7.6.1 Requirements ............................................................................................ 18

7.6.2 Test method .............................................................................................. 19

8 Requirements and tests concerning air circuit performance ............................................ 19

8.1 General ................................................................................................................. 19

8.2 Flow-rate stability .................................................................................................. 19

8.2.1 Requirements ............................................................................................ 19

8.2.2 Test method .............................................................................................. 19

8.3 Accuracy of the flow-rate measurement ................................................................. 19

8.3.1 Requirements ............................................................................................ 19

8.3.2 Test method .............................................................................................. 19

8.4 Effect of filter pressure drop .................................................................................. 20

8.4.1 Requirements ............................................................................................ 20

8.4.2 Test method .............................................................................................. 20

8.5 Low sampling flow-rate indication .......................................................................... 20

8.5.1 Requirements ............................................................................................ 20

8.5.2 Test method .............................................................................................. 20

9 Requirements and tests concerning environmental performance ..................................... 20

9.1 Response to ambient gamma radiation .................................................................. 20

9.1.1 Requirements ............................................................................................ 20

9.1.2 Test method .............................................................................................. 21

9.2 Number concentration of aerosols ......................................................................... 21

9.2.1 Requirements ............................................................................................ 21

9.2.2 Test method .............................................................................................. 21

9.3 Ambient temperature ............................................................................................. 21

9.3.1 Requirements ............................................................................................ 21

9.3.2 Test method .............................................................................................. 21

9.4 Relative humidity and condensed moisture ............................................................ 21

9.4.1 Requirements ............................................................................................ 21

9.4.2 Test method .............................................................................................. 22

9.5 Atmospheric pressure ............................................................................................ 22

10 Requirements and tests concerning electrical performance ............................................ 22

10.1 Warm-up time ........................................................................................................ 22

10.1.1 Requirements ............................................................................................ 22

10.1.2 Test method .............................................................................................. 22

10.2 Power supply variations......................................................................................... 22

10.2.1 Requirements ............................................................................................ 22

10.2.2 Test method .............................................................................................. 23

10.3 Battery test ............................................................................................................ 23

10.3.1 Requirements ............................................................................................ 23

10.3.2 Test method .............................................................................................. 23

11 Requirements and tests concerning mechanical performance ......................................... 23

11.1 Requirements ........................................................................................................ 23

11.2 Test method .......................................................................................................... 23

12 Operation and maintenance manual ............................................................................... 24

13 Type test report and certificate ....................................................................................... 24

---------------------- Page: 9 ----------------------
SIST EN 61577-3:2015
– 4 – 61577-3 © IEC:2011
Table 1 – Reference conditions and standard test conditions (unless otherwise

indicated by the manufacturer) .............................................................................................. 25

Table 2 – Tests of the radiation detection performance ......................................................... 26

Table 3 – Tests performed with variation of influence quantities............................................ 26

Table 4 – Tests of the air circuit ............................................................................................ 26

---------------------- Page: 10 ----------------------
SIST EN 61577-3:2015
61577-3 © IEC:2011 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RADIATION PROTECTION INSTRUMENTATION –
RADON AND RADON DECAY PRODUCT
MEASURING INSTRUMENTS –
Part 3: Specific requirements for radon decay product
measuring instruments
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61577-3 has been prepared by sub-committee 45B: Radiation

protection instrumentation, of IEC technical committee 45: Nuclear instrumentation.

This second edition of IEC 61577-3 cancels and replaces IEC 61577-3:2002 and
IEC 61263:1994. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
– Implementation of new requirements and tests concerning radiation detection
performance.

– Implementation of new requirements and tests concerning environmental performance.

---------------------- Page: 11 ----------------------
SIST EN 61577-3:2015
– 6 – 61577-3 © IEC:2011

– Harmonization of the requirements and tests concerning electrical and mechanical

performance with other standards in the area of radiation protection instrumentation.

The text of this standard is based on the following documents:
FDIS Report on voting
45B/700/FDIS 45B/716/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts of the IEC 61577 series, under the general title Radiation protection

instrumentation – Radon and radon decay product measuring instruments, can be found on

the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 12 ----------------------
SIST EN 61577-3:2015
61577-3 © IEC:2011 – 7 –
INTRODUCTION
226 223 224
Radon is a radioactive trace gas produced by the decay of Ra, Ra and Ra,
238 235 232

respectively decay products of U, U and Th which are present in the earth's crust. By

222 219 220

decay, radon isotopes (i.e., Rn, Rn, Rn) produce three decay chains, each ending in a

220
stable lead isotope. The radon isotope Rn generally is called thoron .
219

NOTE In normal conditions, due to the very short half-life of Rn, its activity and the activity of its RnDP are

considered negligible compared to the activity of the two other series. Its health effects are therefore not important.

219
Thus in this standard Rn and its decay products are not considered.

Radon isotopes and their corresponding short-lived Radon Decay Products (RnDP) (i.e.,

218 214 214 214 222 216 212 212 212 208 220
Po, Pb, Bi, Po for Rn, and Po, Pb, Bi, Po, Tl for Rn) are of

considerable importance, as they constitute the major part of the radiological exposure to

natural radioactivity for the general public and workers. In some workplaces such as

underground mines, spas and waterworks, the workers are exposed to very significant levels

of RnDP. Various quantities of these radionuclides are airborne in a gaseous form for the

radon isotopes and as particulates for the radon decay products. It is worthwhile for health

physicists to be able to measure with a great accuracy the level of this kind of natural

radioactivity in the atmosphere. Because of the unique behaviour of these radioactive

elements in the atmosphere and in the corresponding measuring instruments, it is necessary

to formalize the way such instruments could be tested.

The standard series IEC 61577 covers specific requirements concerning test and calibration

of radon and radon decay product measuring instruments. In order to facilitate its use, the

IEC 61577 series is divided into the following different parts:

IEC 61577-1 (Normative): This part deals with the terminology and units used in the specific

area of radon and radon decay products (RnDP) measurements and describes briefly the

System for Test Atmospheres with Radon (STAR) used for test and calibration of radon and

RnDP measuring devices.
222 220

IEC 61577-2 (Normative): This part is dedicated to the test of Rn and Rn measuring

instruments.
IEC 61577-3 (Normative): This part is dedicated to the test of RnDP and RnDP
222 220
measuring instruments.

IEC 61577-4 (Normative): This part describes the construction of a STAR and its use for

testing.

IEC 61577-5 (Informative): This is a technical guide concerning special features of radon and

radon decay products as well as their measurement.
___________
220

The term thoron is not used in this standard. Instead, the term radon is used to denote the radionuclides Rn

222

and Rn. In the case of only one radionuclide being explicitely specified, the atomic mass number and the

chemical symbol will be given.

RnDP is the acronym of Radon Decay Products which are sometimes denoted as radon progeny. The term

Radon Decay Product or its abbreviation (RnDP) denotes the whole set of short-lived decay products that are

the focus of this standard. A particular isotope is indicated by its chemical symbol preceded by its mass

number. The subscripts , added to the symbol RnDP refer to the whole set of short-lived decay products

222 220
218 214 214 214 216 212 212

of the corresponding radon isotope (RnDP : Po, Pb, Bi, Po, and RnDP : Po, Pb, Bi,

222 220
212 208
Po, Tl).
---------------------- Page: 13 ----------------------
SIST EN 61577-3:2015
– 8 – 61577-3 © IEC:2011
RADIATION PROTECTION INSTRUMENTATION –
RADON AND RADON DECAY PRODUCT
MEASURING INSTRUMENTS –
Part 3: Specific requirements for radon decay product
measuring instruments
1 Scope

This part of IEC 61577 describes the specific requirements for instruments measuring the

volumetric activity of airborne short-lived radon decay products and/or their ambient potential

alpha-energy concentration outdoors, in dwellings, and in workpla
...

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