1、 IEC/TS 62743 Edition 1.0 2012-09 TECHNICAL SPECIFICATION Radiation protection instrumentation Electronic counting dosemeters for pulsed fields of ionizing radiation IEC/TS 62743:2012(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2012 IEC, Geneva, Switzerland All rights reserved. Unless other
2、wise 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 IEC or IECs member National Committee in the country of the requester. If you have any ques
3、tions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. IEC Central Office Tel.: +41 22 919 02 11 3, rue de Varemb Fax: +41 22 919 03 00 CH-1211 Geneva 20
4、 infoiec.ch Switzerland www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC pub
5、lications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. Useful links: IEC publications search - www.iec.ch/searchpub The advanced search enables you to find IEC publications by a variety of criteri
6、a (reference number, text, technical committee,). It also gives information on projects, replaced and withdrawn publications. IEC Just Published - webstore.iec.ch/justpublished Stay up to date on all new IEC publications. Just Published details all new publications released. Available on-line and al
7、so once a month by email. Electropedia - www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnic
8、al Vocabulary (IEV) on-line. Customer Service Centre - webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC/TS 62743 Edition 1.0 2012-09 TECHNICAL SPECIFICATION Radiation protection instrum
9、entation Electronic counting dosemeters for pulsed fields of ionizing radiation INTERNATIONAL ELECTROTECHNICAL COMMISSION T ICS 13.280 PRICE CODE ISBN 978-2-83220-364-4 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an
10、 authorized distributor. 2 TS 62743 IEC:2012(E) CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 8 2 Normative references . 9 3 Terms and definitions, abbreviations and symbols, quantities and units 9 3.1 Terms and definitions 9 3.2 List of symbols and abbreviations 11 3.3 Quantities and units 12 4
11、General test procedure . 13 4.1 Nature of test 13 4.2 Reference conditions and standard test conditions 13 5 General requirements . 13 5.1 Summary of requirements 13 5.2 Parameters required to be known of the pulsed radiation field . 13 5.3 Parameters required to be determined of the counting doseme
12、ter . 13 5.4 Criteria for suitability of a dosemeter in pulsed radiation fields 13 5.4.1 General . 13 5.4.2 Radiation pulse duration larger than or equal to the dead time: t pulse t dead14 5.4.3 Radiation pulse duration shorter than the dead time: t pulse t dead14 5.5 Type of radiation . 14 5.6 Mech
13、anical characteristics 14 5.7 Requirements to software, data and interfaces 14 6 Radiation detection requirements . 15 6.1 General . 15 6.2 Indication of the dose rate and the number of counts . 15 6.2.1 Requirements 15 6.2.2 Method of test . 15 6.2.3 Interpretation of the results 16 6.3 Measurement
14、 cycle time, T cycle16 6.3.1 Requirements 16 6.3.2 Method of test . 16 6.3.3 Interpretation of the results 17 6.4 Indication per counting event, G count17 6.4.1 Requirements 17 6.4.2 Method of test . 17 6.4.3 Interpretation of the results 17 6.5 Dead time, t dead. 17 6.5.1 Requirements 17 6.5.2 Meth
15、od of test . 17 6.5.3 Interpretation of the results 18 6.6 Maximum measurable dose rate value, max count, H . 18 6.6.1 Requirements 18 6.6.2 Method of test . 19 6.6.3 Interpretation of the results 19 TS 62743 IEC:2012(E) 3 6.7 Pulse dose rate overload alarm . 19 6.7.1 General . 19 6.7.2 Requirements
16、 19 6.7.3 Method of test . 19 6.7.4 Interpretation of the results 19 6.8 Proof of model function and pulse overload alarm . 20 6.8.1 General . 20 6.8.2 Requirements 20 6.8.3 Method of test . 20 6.8.4 Interpretation of the results 20 7 Environmental requirements . 21 8 Mechanical requirements 21 9 El
17、ectromagnetic requirements 21 10 Documentation . 21 10.1 Operation and maintenance manual 21 10.2 Type test report . 21 Annex A (informative) Parameter values for typical workplaces where pulsed radiation occurs . 23 Annex B (informative) Parameters characterizing the pulsed radiation field 24 Bibli
18、ography 25 Table 1 Symbols and abbreviated terms 12 Table 2 Reference conditions and standard test conditions for tests using pulsed radiation . 22 Table 3 Characteristics of counting dosemeters used in pulsed fields of ionizing radiation . 22 Table A.1 Parameter values for workplaces where pulsed r
19、adiation occurs, as of 2012 . 23 4 TS 62743 IEC:2012(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ RADIATION PROTECTION INSTRUMENTATION ELECTRONIC COUNTING DOSEMETERS FOR PULSED FIELDS OF IONIZING RADIATION FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization
20、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 publ
21、ishes 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
22、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 agreeme
23、nt 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 Pub
24、lications 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
25、 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 corres
26、ponding 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 a
27、ny 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
28、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) Att
29、ention 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.
30、IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee may propose the publication of a technical specification when the required support can
31、not be obtained for the publication of an International Standard, despite repeated efforts, or the subject is still under technical development or where, for any other reason, there is the future but no immediate possibility of an agreement on an International Standard. Technical specifications are
32、subject to review within three years of publication to decide whether they can be transformed into International Standards. IEC 62743, which is a technical specification, has been prepared by subcommittee 45B: Radiation protection instrumentation, of IEC technical committee 45: Nuclear instrumentati
33、on. TS 62743 IEC:2012(E) 5 The text of this technical specification is based on the following documents: Enquiry draft Report on voting 45B/706/DTS 45B/726A/RVC Full information on the voting for the approval of this technical specification can be found in the report on voting indicated in the above
34、 table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 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
35、publication. At this date, the publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 6 TS 62743 IEC:2012(E) INTRODUCTION The specification and determina
36、tion of the special characteristics required for dosemeters to be used in pulsed fields of ionizing radiation have been excluded from all standards for direct reading personal and environmental dosemeters issued before 2012 for radiation protection purposes. These standards only specify characterist
37、ics for continuous radiation. This Techni- cal Specification provides the necessary information for the measurement of one single radia- tion pulse, which is the most difficult situation to be measured. The characteristics of a dose- meter for repeated pulses is expected to be better than for one si
38、ngle radiation pulse with the same parameters but worse than for continuous radiation, i.e., in between of the characteris- tics for these two extreme conditions. This Technical Specification applies for such direct reading dosemeters that use pulse counting for the determination of the measured dos
39、e value. Dosemeters that use delayed pulses, e.g., due to activation by neutrons, are excluded. The concept is similar to the concept used for other influence quantities, e.g., radiation energy. The workplace is characterized by the parameter range occurring at that workplace, i.e., in the case of e
40、nergy the expected possible values of radiation energy. It can then be determined if the dosemeter under consideration can be used. The required parameters for a workplace where pulsed radiation occurs are the minimum value of the radiation pulse duration, t pulse, min , occurring at the workplace,
41、the maximum value of the dose rate during the radiation pulse, max pulse, H , occurring at the workplace, the maximum value of the dose per radiation pulse, H pulse, max , occurring at the workplace. The parameters to be determined by the type test of the counting dosemeter are the maximum value of
42、the measurable dose rate in the pulse, max count, H , the dead time of the detector, t dead, the dose indication per each counting event which is registered by the dosemeter electronics, G count , the type of the dead time, i.e., extendable or non-extendable dead time, and finally the measurement cy
43、cle time of the dosemeter, T cycle . In principle, the parameters resulting from the type test could be determined using continuous radiation fields if the detector is connected to a simple, linear and straight forward counting electronics. But nearly any counting dosemeter exhibits one or more of t
44、he following properties. It uses internal range switching, uses software to correct for known deficiencies, e.g., the dead time or the radiation energy, uses special, proprietary algorithms, adjusts the measurement cycle time, T cycle , to the dose rate, dose G , measured by the dosemeter, mitigates
45、 the effect of EMC-pulses and mechanical drops. All these properties could affect the results when determining the characteristics for pulsed radiation fields by using continuous radiation fields. The conclusion is that measurements using pulsed radiation fields are required for testing of dosemeter
46、s. As a help to the user to judge whether or not the dosemeter under consideration can be used, Table A.1 in the informative Annex A gives some parameter values for typical workplaces TS 62743 IEC:2012(E) 7 where pulsed radiation occurs. They are based on the knowledge available in 2012 and may chan
47、ge with the next generation of pulsed radiation generating equipment. This Technical Specification contains much information for which worldwide experience is not available at the date of its development. Therefore, it was decided to publish it as a Technical Specification. It is expected that withi
48、n the next years this experience will be gained and then maintenance of this publication could lead to an International Standard. 8 TS 62743 IEC:2012(E) RADIATION PROTECTION INSTRUMENTATION ELECTRONIC COUNTING DOSEMETERS FOR PULSED FIELDS OF IONIZING RADIATION 1 Scope This Technical Specification ap
49、plies to all types of counting dosemeters, irrespective of the measuring quantity and the type of radiation intended to be measured. It ensures that a single radiation pulse can be correctly measured even if the dosemeter is in the internal state relevant for measuring background or environmental radiation. The characteristics of the dosemeter for repeated pulses is expected to be better than for one single radiation pulse with the same parameters but worse than fo