1、Dosimetry for exposures to cosmic radiation in civilian aircraftPart 3: Measurements at aviation altitudesBS EN ISO 20785-3:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06EUROPEANSTANDARDNORME EUROPENNE EUROPISCHE NORMEN ISO 20785-3 October 2017ICS 49.020; 13.28
2、0EnglishVersionDosimetry for exposures to cosmic radiation in civilianaircraft - Part 3: Measurements at aviation altitudes (ISO 20785-3:2015)Dosimtrie pour les expositions au rayonnement cosmique bord dun avion civil - Partie 3: Mesurages bord davions (ISO 20785-3:2015)This European Standard was ap
3、proved by CEN on 13 September 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thisEuropean Standard the status of a national standard without any alteration.Up-to-date lists and bibliographical referencesconcerning such nation
4、al 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 bytranslation under the responsibility of a CEN member into its own language
5、 and notified to the CEN-CENELEC ManagementCentre has the same status as the officialversions.CEN members are the nationalstandards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungar
6、y, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CE
7、NELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reservedworldwide for CENnational Members.Ref. No. EN ISO 20785-3:2017 ENational forewordThis British Standard is the UK implementation of EN ISO 20785-3:2017. It is identical
8、to ISO 20785-3:2015. It supersedes BS ISO 20785-3:2015, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee NCE/2, Radiation protection and measurement.A list of organizations represented on this committee can be obtained on request to its secretary.This p
9、ublication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 96931 7ICS 49.020; 13.280Compliance with a British Standard cannot confer
10、 immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate Text affected31 December 2017 This corrigendum renumbers BS ISO 20785-3:2015 as BS EN ISO 207
11、85-3:2017BRITISH STANDARDBS EN ISO 20785-3:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 20785-3 October 2017 ICS 49.020; 13.280 English Version Dosimetry for exposures to cosmic radiation in civilian aircraft - Part 3: Measurements at aviation altitudes (ISO 20785-3:2015) Dosimtrie p
12、our les expositions au rayonnement cosmique bord dun avion civil - Partie 3: Mesurages bord davions (ISO 20785-3:2015) This European Standard was approved by CEN on 13 September 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving
13、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 officia
14、l 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 Au
15、stria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Sp
16、ain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwi
17、de for CEN national Members. Ref. No. EN ISO 20785-3:2017 EBS EN ISO 20785-3:2017EN ISO 20785-3:2017 (E) 3 European foreword The text of ISO 20785-3:2015 has been prepared by Technical Committee ISO/TC 85 “Nuclear energy, nuclear technologies, and radiological protection” of the International Organi
18、zation for Standardization (ISO) and has been taken over as EN ISO 20785-3:2017 by 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, ei
19、ther by publication of an identical text or by endorsement, at the latest by April 2018, and conflicting national standards shall be withdrawn at the latest by April 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall
20、not be held responsible for identifying any or all such patent rights. 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, Denmar
21、k, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsem
22、ent notice The text of ISO 20785-3:2015 has been approved by CEN as EN ISO 20785-3:2017 without any modification. ISO 20785-3:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 13.1 Quantities and units . 13.2 Atmospheric radiation field . 44 General conside
23、rations 64.1 General description of the cosmic radiation field in the atmosphere . 64.2 General considerations concerning the measurements 84.2.1 General 84.2.2 Selection of appropriate instruments 84.2.3 Characterization of the responses of the instruments 84.2.4 Measurements inside an aircraft . 8
24、4.2.5 Application of appropriate correction factors 94.3 Safety and regulatory requirements for in-flight measurements . 95 Measurement at aviation altitude 95.1 Parameters determining the dose rate. 95.1.1 Barometric altitude . 95.1.2 Geographic coordinates . 95.1.3 Solar activity . 105.2 Possible
25、influence quantities . 105.2.1 General. 105.2.2 Cabin air pressure 105.2.3 Cabin air temperature 105.2.4 Cabin air humidity .105.3 Specific considerations for active instruments 105.3.1 Power supply 105.3.2 Vibrations and shocks 115.3.3 Electromagnetic interferences from the aircraft .115.4 Specific
26、 considerations for passive measurements 115.4.1 Security X-ray scanning . 115.4.2 Background subtraction . 116 Uncertainties .11Annex A (informative) Representative particle fluence energy distributions for the cosmic radiation field at flight altitudes for solar minimum and maximum conditions and
27、for minimum and maximum vertical cut-off rigidity 12Bibliography .16 ISO 2015 All rights reserved iiiContents PageBS EN ISO 20785-3:2017ISO 20785-3:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 13.1 Quantities and units . 13.2 Atmospheric radiation fiel
28、d . 44 General considerations 64.1 General description of the cosmic radiation field in the atmosphere . 64.2 General considerations concerning the measurements 84.2.1 General 84.2.2 Selection of appropriate instruments 84.2.3 Characterization of the responses of the instruments 84.2.4 Measurements
29、inside an aircraft . 84.2.5 Application of appropriate correction factors 94.3 Safety and regulatory requirements for in-flight measurements . 95 Measurement at aviation altitude 95.1 Parameters determining the dose rate. 95.1.1 Barometric altitude . 95.1.2 Geographic coordinates . 95.1.3 Solar acti
30、vity . 105.2 Possible influence quantities . 105.2.1 General. 105.2.2 Cabin air pressure 105.2.3 Cabin air temperature 105.2.4 Cabin air humidity .105.3 Specific considerations for active instruments 105.3.1 Power supply 105.3.2 Vibrations and shocks 115.3.3 Electromagnetic interferences from the ai
31、rcraft .115.4 Specific considerations for passive measurements 115.4.1 Security X-ray scanning . 115.4.2 Background subtraction . 116 Uncertainties .11Annex A (informative) Representative particle fluence energy distributions for the cosmic radiation field at flight altitudes for solar minimum and m
32、aximum conditions and for minimum and maximum vertical cut-off rigidity 12Bibliography .16 ISO 2015 All rights reserved iiiContents PageBS EN ISO 20785-3:2017ISO 20785-3:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS
33、O 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, gove
34、rnmental 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 mainten
35、ance 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).Attenti
36、on 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 a
37、nd/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 meaning of ISO specific terms and expressions related to conformity
38、assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 85, Nuclear energy, nuclear technologies, and radiological protectio
39、n, Subcommittee SC 2, Radiological protection.ISO 20785 consists of the following parts, under the general title Dosimetry for exposures to cosmic radiation in civilian aircraft: Part 1: Conceptual basis for measurements Part 2: Characterization of instrument response Part 3: Measurements at aviatio
40、n altitudesiv ISO 2015 All rights reservedBS EN ISO 20785-3:2017ISO 20785-3:2015(E)ForewordISO (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 throug
41、h 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 collaborat
42、es 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 cri
43、teria 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 o
44、f 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
45、 used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical
46、 Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 85, Nuclear energy, nuclear technologies, and radiological protection, Subcommittee SC 2, Radiological protection.ISO 20785 consists of the following parts, under
47、 the general title Dosimetry for exposures to cosmic radiation in civilian aircraft: Part 1: Conceptual basis for measurements Part 2: Characterization of instrument response Part 3: Measurements at aviation altitudesiv ISO 2015 All rights reserved ISO 20785-3:2015(E)IntroductionAircraft crews are e
48、xposed to elevated levels of cosmic radiation of galactic and solar origin and secondary radiation produced in the atmosphere, the aircraft structure and its contents. Following recommendations of the International Commission on Radiological Protection in Publication 60,1confirmed by Publication 103
49、,2the European Union (EU) introduced a revised Basic Safety Standards Directive3which included exposure to natural sources of ionizing radiation, including cosmic radiation, as occupational exposure. The Directive requires account to be taken of the exposure of aircraft crew liable to receive more than 1 mSv per year. It then identifies the following four protection measures: (i) to assess the exposure of the crew concerned; (ii) to take into account the assessed exposure when organizing working schedules with a view to reducing the do
