EN ISO 20785-2:2020

SLOVENSKI STANDARD
01-oktober-2020
Nadomešča:
SIST EN ISO 20785-2:2017
Dozimetrija za merjenje izpostavljenosti kozmičnemu sevanju v civilnem letalskem
prometu - 2. del: Karakterizacija odziva instrumenta (ISO 20785-2:2020)
Dosimetry for exposures to cosmic radiation in civilian aircraft - Part 2: Characterization
of instrument response (ISO 20785-2:2020)
Dosimetrie zu Expositionen durch kosmische Strahlung in Flugzeugen der zivilen
Luftfahrt - Teil 2: Charakterisierung des Antwortverhaltens von Messinstrumenten (ISO
20785-2:2020)
Dosimétrie pour l'exposition au rayonnement cosmique à bord d'un avion civil - Partie 2:
Caractérisation de la réponse des instruments (ISO 20785-2:2020)
Ta slovenski standard je istoveten z: EN ISO 20785-2:2020
ICS:
17.240 Merjenje sevanja Radiation measurements
49.020 Letala in vesoljska vozila na Aircraft and space vehicles in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20785-2
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2020
EUROPÄISCHE NORM
ICS 13.280; 49.020 Supersedes EN ISO 20785-2:2017
English Version
Dosimetry for exposures to cosmic radiation in civilian
aircraft - Part 2: Characterization of instrument response
(ISO 20785-2:2020)
Dosimétrie pour l'exposition au rayonnement Dosimetrie für die Belastung durch kosmische
cosmique à bord d'un avion civil - Partie 2: Strahlung in Zivilluftfahrzeugen - Teil 2:
Caractérisation de la réponse des instruments (ISO Charakterisierung des Ansprechvermögens von
20785-2:2020) Messinstrumenten (ISO 20785-2:2020)
This European Standard was approved by CEN on 30 June 2020.

CEN 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 CEN
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 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 Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20785-2:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 20785-2:2020) has been prepared by Technical Committee ISO/TC 85 "Nuclear
energy, nuclear technologies, and radiological protection" in collaboration with 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, either by publication of an
identical text or by endorsement, at the latest by February 2021, and conflicting national standards
shall be withdrawn at the latest by February 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 20785-2:2017.
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, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 20785-2:2020 has been approved by CEN as EN ISO 20785-2:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 20785-2
Second edition
2020-07
Dosimetry for exposures to cosmic
radiation in civilian aircraft —
Part 2:
Characterization of instrument
response
Dosimétrie pour l'exposition au rayonnement cosmique à bord d'un
avion civil —
Partie 2: Caractérisation de la réponse des instruments
Reference number
ISO 20785-2:2020(E)
©
ISO 2020
ISO 20785-2:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 20785-2:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General terms . 1
3.2 Terms related to quantities and units . 5
3.3 Atmospheric radiation field . 7
4 General considerations . 8
4.1 The cosmic radiation field in the atmosphere . 8
4.2 General considerations for the dosimetry of the cosmic radiation field in aircraft
and requirements for the characterization of instrument response . 9
4.3 General considerations for measurements at aviation altitudes .10
5 Calibration fields and procedures .12
5.1 General considerations .12
5.2 Characterization of an instrument .14
5.2.1 Determination of the dosimetric characteristics of an instrument .14
5.2.2 Reference radiation fields .16
5.2.3 Scattered radiation . .16
5.2.4 Effect of other types of radiation .16
5.2.5 Requirements for characterization in non-reference conditions .17
5.2.6 Use of numerical simulations .17
5.3 Instrument-related software .17
5.3.1 Software development procedures .17
5.3.2 Software testing .18
5.3.3 Data analysis using spreadsheets .18
6 Uncertainties .18
7 Remarks on performance tests .18
Annex A (informative) Representative particle fluence energy distributions for the cosmic
radiation field at flight altitudes for solar minimum and maximum conditions and
for minimum and maximum vertical cut-off rigidity .19
Annex B (informative) Radiation fields recommended for use in calibrations .25
Annex C (informative) Comparison measurements .29
Annex D (informative) Charged-particle irradiation facilities .31
Bibliography .32
ISO 20785-2:2020(E)
Foreword
ISO (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
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, governmental 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 maintenance 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).
Attention 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 and/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
assessment, as well as information about ISO's adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee
...