IEC 61577-3-2011 Radiation protection instrumentation - Radon and radon decay product measuring instruments - Part 3 Specific requirements for radon decay produ.pdf

1、 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 mes

2、ure du radon et des descendants du radon Partie 3: Exigences spcifiques concernant les instruments de mesure des descendants du radon IEC61577-3:2011 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2011 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publi

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17、NATIONALE 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 spcifi

18、ques concernant les instruments de mesure des descendants du radon INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 13.280 PRICE CODE CODE PRIX ISBN 978-2-88912-839-6 Registered trademark of the International Electrotechnical Commission Marque dpose de la Co

19、mmission Electrotechnique Internationale 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 sur

20、faces 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 mainten

21、ance 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 condit

22、ions . 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

23、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 18 615

24、77-3 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 f

25、low-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

26、 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 Re

27、quirements 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 Re

28、quirements 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 4 61577-3 IEC:2011 Table 1 Reference conditions and standard test conditions

29、 (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 61577-3 IEC:2011 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ RADIATION PROTECTION INS

30、TRUMENTATION 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 commit

31、tees (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

32、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 a

33、nd 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 agreeme

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35、 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 i

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39、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 publicatio

40、n. 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 pa

41、tent 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

42、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. 6

43、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 i

44、nformation 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

45、 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

46、 specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 61577-3 IEC:2011 7 INTRODUCTION Radon is a radioactive trace gas produced by the decay of 226Ra, 223Ra and 224Ra, respectively decay products of 238U, 235U and 232Th which

47、are present in the earths crust. By decay, radon isotopes (i.e., 222Rn, 219Rn, 220Rn) produce three decay chains, each ending in a stable lead isotope. The radon isotope 220Rn generally is called thoron1. NOTE In normal conditions, due to the very short half-life of 219Rn, its activity and the activ

48、ity of its RnDP2are considered negligible compared to the activity of the two other series. Its health effects are therefore not important. Thus in this standard 219Rn and its decay products are not considered. Radon isotopes and their corresponding short-lived Radon Decay Products (RnDP) (i.e., 218

49、Po, 214Pb, 214Bi, 214Po for 222Rn, and 216Po, 212Pb, 212Bi, 212Po, 208Tl for 220Rn) 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 ai