Erythema reference action spectrum and standard erythema dose

This document specifies the erythema reference action spectrum, ser(λ), and the standard erythema dose (SED).

Spectre d'action érythémale de référence et dose érythémale normalisée

General Information

Status
Published
Publication Date
20-May-2019
Current Stage
6060 - International Standard published
Start Date
09-Apr-2019
Completion Date
21-May-2019
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INTERNATIONAL ISO/CIE
STANDARD 17166
First edition
2019-05
Erythema reference action spectrum
and standard erythema dose
Spectre d'action érythémale de référence et dose érythémale
normalisée
Reference number
ISO/CIE 17166:2019(E)
ISO/CIE 2019
---------------------- Page: 1 ----------------------
ISO/CIE 17166:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/CIE 2019

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

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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO/CIE 2019 – All rights reserved
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ISO/CIE 17166:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Concept of erythemal irradiance and dose ............................................................................................................................... 3

4.1 Erythemal irradiance ......................................................................................................................................................................... 3

4.2 Erythema spectral weighting function ............................................................................................................................... 4

4.3 Standard erythema dose ................................................................................................................................................................. 4

Bibliography ................................................................................................................................................................................................................................ 5

© ISO/CIE 2019 – All rights reserved iii
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ISO/CIE 17166:2019(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 of 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 www .iso

.org/iso/foreword .html.

This document was prepared by the International Commission on Illumination (CIE) in cooperation

with Technical Committee ISO/TC 274, Light and lighting.

This first edition of ISO/CIE 17166 cancels and replaces ISO 17166:1999 | CIE S 007-1998, of which it

constitutes a minor revision. The document has been editorially revised as per current ISO rules and

the references have been updated.

Any feedback or questions on this document should be directed to the CIE Central Bureau or to the user’s

national standards body. A complete listing of these bodies can be found at www .iso .org/members .html.

iv © ISO/CIE 2019 – All rights reserved
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ISO/CIE 17166:2019(E)
Introduction

The problem of dosimetry in skin photobiology lies in the fact that the ability of ultraviolet (UV)

radiation to elicit erythema in human skin depends strongly on wavelength, encompassing a range

of four orders of magnitude between 250 nm and 400 nm. Thus, a statement that a subject received

−2 4 −2

an exposure dose of 1 J·cm (10 J·m ) of UV radiation conveys nothing about the consequences of

that exposure in terms of erythema. If the radiation source was a UV-A fluorescent lamp, no erythemal

response would be seen apart from in people exhibiting severe, abnormal pathological photosensitivity.

The same dose delivered from an unfiltered mercury arc lamp or fluorescent sun-lamp would result

in marked violaceous erythema in most white-skinned individuals. Consequently, photobiologists have

[1]

long recognized the need to express the exposure as an erythemally weighted quantity .

Recently, the term "minimal erythema dose (MED)" has been used widely as a measure of erythemal

radiation. This is unreasonable because the MED is not a standard measure of anything but, on the

contrary, encompasses the variable nature of individual sensitivity to UV radiation. Variables that affect

the MED include: optical and radiometric characteristics of the source; determinants of the exposure,

such as dose increment and field size; nature of the skin, such as pigmentation, previous light exposure

and anatomical site; and observational factors, such as definition of the endpoint, time of reading after

exposure and ambient illumination.

To avoid further confusing misuse of the term MED, it is proposed that this term be reserved solely for

observational studies in humans and other animals, and that a new term, the "standard erythema dose

(SED)", be used as a standardized measure of erythemogenic UV radiation.
© ISO/CIE 2019 – All rights reserved v
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INTERNATIONAL STANDARD ISO/CIE 17166:2019(E)
Erythema reference action spectrum and standard
erythema dose
1 Scope

This document specifies the erythema reference action spectrum, s (λ), and the standard erythema

dose (SED).
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

CIE S 017:—, ILV: International Lighting Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in CIE S 017 and the following apply.

ISO
...

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