Standard Guide for Illuminators Used for Viewing Industrial Radiographs

SCOPE
1.1 This guide provides the recommended minimum requirements for illuminators used for viewing industrial film radiographs using transmitted light.
1.2 The illuminator has to ensure the same safety for personnel, or users of any electric apparatus, as specified by electrical standards applicable in the country in which the illuminator is used.

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09-May-2000
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ASTM E1390-90(2000) - Standard Guide for Illuminators Used for Viewing Industrial Radiographs
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E1390–90(Reapproved 2000)
Standard Guide for
Illuminators Used for Viewing Industrial Radiographs
This standard is issued under the fixed designation E 1390; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope size of the screen shall allow the user to view the radiograph
without excessive glare. If the illuminator is to be used for
1.1 This guide provides the recommended minimum re-
viewing radiographs of various sizes, masks of various sizes
quirements for illuminators used for viewing industrial film
and configurations, for example, circular or rectangular, shall
radiographs using transmitted light.
be provided. Alternately, an adjustable aperture may be used.
1.2 The illuminator has to ensure the same safety for
personnel, or users of any electric apparatus, as specified by
6. Illumination Requirements
electrical standards applicable in the country in which the
6.1 Luminance:
illuminator is used.
6.1.1 The luminance (or brightness) of the transmitted light
2. Referenced Documents through the radiograph shall not be less than 30 cd/m for film
densities equal or less than 2.5, and 10 cd/m for film densities
2.1 ASTM Standards:
greater than 2.5.
E 1316 Terminology for Nondestructive Examinations
NOTE 1—Where possible, approximately 100 cd/m or higher lumi-
3. Terminology
nance should be used.
3.1 Definitions—For definitions of terms used in this guide,
6.1.2 To achieve the maximum luminance value, that is, 10
see Terminology E 1316. 2
cd/m , given in 6.1.1, the illuminator brightness shall be at
5 2
least 10 cd/m . This should be determined with a suitably
4. Significance and Use
calibrated photometer or telephotometer placed at the center of
4.1 The function of the illuminator is to provide sufficient
the viewing surface. Follow manufacturer’s instructions in
illumination and viewing capabilities to visually review indus-
using the photometer.
trial film radiographs by light transmitted through them for the
6.1.3 When servicing is required, it shall usually be suffi-
purpose of identification and interpretation of the images.
cient to follow manufacturer’s recommendations in, for ex-
4.2 This guide is to be used primarily for the manufacturer
ample, replacing a bulb.
of illuminators and is not intended to be applicable to the users
6.2 Spectral Characteristics of Illuminator Light Source—
of illuminators. Requirements, if imposed on users, should be
The color of the light used to illuminate the radiograph is
established by contractual agreement.
normally “white.” However, in the case of colored film bases,
light with adapted colors may be used if they have been
5. Design Characteristics
recommended by the film manufacturers.
5.1 General—The illuminator shall consist of a housing
6.3 Diffusion of Light—If the illuminator has a diffusing
with one or more of the sides containing a viewing screen
screen, the light shall be sufficiently divergent so that both eyes
illuminated from the inside of the housing. The viewing screen
of the observer receive rays from all parts of the screen. The
may also be the diffusing screen. There shall be thermal
divergence factor shall exceed 0.7 (see 9.1.1).
protection to prevent overheating, and subsequent damage to
6.4 Uniformity of Illumination—The screen shall be uni-
the radiographs placed on the viewing screen. The housing or
formly illuminated, the uniformity factor g being higher than
system may or may not require ventilation. A rheostat or
0.5 (see 9.1.2).
suitable electrical circuit shall be provided to vary the light
intensity.
7. Anti-Glare Protection
5.2 Viewing Screen—The viewing screen shall be easy to
7.1 The illuminator shall be fitted with an anti-glare switch
clean and made of material which is resistant to scratches. The
or device that minimizes the probability of the operator being
subjected to excessive glare when the radiograph is removed.
1 This switch or device may be manual or automatic.
ThisguideisunderthejurisdictionofASTMCommitteeE-7onNondestructive
Testing and is the direct responsibility of Subcommittee E07.01 on Radiology (X
and Gamma) Method.
Current edition approved Oct. 26, 1990. Published December 1990. Luminance requirements are intended to be satisfied by the illuminator
Annual Book of ASTM Standards, Vol 03.03. manufacturer.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E1390–90 (2000)
8. Heating
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