MIL-PRF-49293B
document, however, supersedes applicable laws and regulations unless a specific
exemption has been obtained.
3. REQUIREMENTS
3.1 AN/PDR-75 System Description. The AN/PDR-75 Radiac Set consists of the
Computer Indicator Radiac CP-696/PDR-75 (Reader), the Carrying Case CY-8420/PDR-
75 and three power cables. The Dosimeter (DT-236/PDR-75) is used with but not a part
of the Radiac Set. It measures neutrons and gammas from nuclear detonations and
residual neutrons and gammas from contamination. The dosimeter is contained in a two-
part case and is a type that can be worn the same as a wristwatch. The Reader is capable
of opening, reading and closing the dosimeter. Two separate reading elements are
contained in the Reader, consisting of an ultraviolet light source, filters and a light
detector for reading the gamma dose, plus a constant current source and a peak reading
voltmeter for reading the neutron dose. A digital meter displays a combined reading of
the two separate reading elements. The range of the system is zero to one thousand
centigrays (cGy) (threshold) and zero to two thousand cGy (objective). The CP-
696/PDR-75 is powered from a 24 volt DC source.
3.1.1 Functional Description. The CP-696/PDR-75 Radiac Computer Indicator is used to
measure the accumulated neutron and gamma radiation recorded by the Dosimeter DT-
236/PDR-75. The Radiac Detector DT-236/PDR-75 is worn by personnel who may be
exposed to radiation from nuclear weapons.
3.1.2 First Article. When specified in the contract (See 6.2), the contractor should furnish
first article units for inspection (See 4.3).
3.2 Materials. The contractor should select the materials, but the materials and parts used
should be fully capable of meeting all of the operational and environmental requirements
specified herein. The materials specified in the applicable drawings are recommended,
but are not mandatory. Selection criteria of the class, grade or type part should be that the
material will be able to perform its intended function when it is assembled. Verification
of the supplier meeting the overall performance requirements should be the governing
acceptance standard. Recovered materials should be used to the maximum extent
possible.
3.2.1 Bonds and Grounds. Bonding for equipment current path returns, RF potentials and
shock hazards should be installed so that expansion, contraction, or movement incident to
normal service use and maintenance will not break or loosen the connections. Surface
preparation for bonds and grounds should be accomplished by removing all anodic film,
grease, paint, lacquer or other high resistance coatings from the immediate areas of
contact. The equipment finish should be restored to its original condition. The DC
resistance of bonds and grounds should not exceed 25.0 milliohms. (See 4.8.1).
3.2.2 Cables and Connectors. Shielded cables, when required, should have a shield weave
providing 90% coverage. For guidance, refer to requirement 11 of MIL-HDBK-454.
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