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
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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
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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
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