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Check of photographic density of film |
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|  MIL-C-64037 (AR)
Location of the penetrameter hole shall be 6 3/4 inches
measured from base shoulder of projectile body towards fuze
nose threads. The projectile, with attached penetrameter,
shall be positioned between the radiographic source and the
radiographic film with the penetrameter facing the radiographic
source. When radiographing a group of projectiles on a
rotating ring, the penetrameter, taped to a projectile, may be
used to represent the group when checking sensitivity. The
sensitivity of radiographic technique shall be considered
satisfactory when the image of the penetrameter, including the
holes, is sharply defined on the radiograph. The penetrameter
shall be made of steel having an approximate specific gravity
of 7.8. Penetrameter thickness shall be .020 plus or minus ()
.010 inches. Each penetrameter shall have a circular hole with
a diameter twice that of the penetrameter thickness. For
further details on construction of the penetrameters, see
MIL-STD-453. Frequency of sensitivity check shall be no less
than one in each fifty (50) radiographs.
4.5.3.2 Check of photographic density of film. The
photographic density of the film shall be determined on the
film in the region of the maximum equivalent thickness to be
radiographed. Film density shall be checked each hour of
operation, or fraction thereof, for each film processor.
Greater frequency shall be required for any period during which
dificulty is encountered in establishing the required
densities. To judge densities, it is recommended that
standards be used. Comparison of the film with standards may
be made visually; however, the use of a densitometer is
recommended.
4.5.3.3 Personnel qualification and certification.
Personnel performing the radiographic examination in accordance
with paragraph 4.5.3 shall meet the qualification and
certification requirements defined in MIL-STD-410 as follows:
4.5.3.3.1
Set up and calibration.
Level III.
Level I.
4.5.3.3.2
Operator.
4.5 .3.3.3 Documentation. The contractor will prepare and
submit for approval, in accordance with data item description
DI-S-3628 and the DD Form 1423, his detailed procedures for
qualification and certification of personnel performing the
non-destructive testing procedures required herein.
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