a
CRLR - 297
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ATTENUATION OF 1.2 MEV GAMMA RADIATION BY SOVIET AND
U. S. MILITARY VEHICLES AND U. S. RAIL EQUIPMENT.
Robert P. Beckelheimer and Ralph E. Rexroad, 1 August 1953.
CONFIDENTIAL
The object of the work described in this report was to determine
e amount of shielding from gamma radiation afforded by certain Soviet and
U. S. military vehicles and U. S. rail equipment, when operated in areas
contaminated with Co©0 (gamma energies of 1.17 and 1.33 Mev).
Under the conditions of the test, practical attenuation factors
(the dose rate inside the vehicle divided by the dose rate 3 ft above the
center of the road outside) for gamma radiation from a 20-ft roadway when
the vehicles were located at the center of the road ranged from 0.02 to
0.44.
The attenuation factors for vehicles traveling along the shoulder
of the road ranged from 0.005 to 0.29.
Sandbags over the floor boards and
mitual shielding by personnel riding in the bed of the truck have negligible
effect on the dose rate.
to personnel in the cab.
The load of a cargo truck offers little shielding
Practical attenuation factors for gamma radiation from a level
field with the vehicles located at the center varied from 0.025 to 0.75.
Decontamination of a 16-ft wide strip through the field reduced
the dosage rate by 30% when the contaminant was merely swept aside, and
by 50% when the contaminant was removed for personnel walking through the
field.
These factors are increased as the mode of conveyance changed from
walking or riding in a jeep to riding in larger vehicles.
Practical attenuation factors for gamma radiation from a level
field with rail equipment located at the center ranged from 0.15 to 0.55.
CRLR - 298
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PROTECTION AFFORDED BY OPERATIONAL SMOKE SCREENS AGAINST
THERMAL RADIATION (WI-768).
(Operation KNOTHOLE)
Eimer H. Engqvist and Charles W. Forsthoff, 7 December 1953.
CONFIDENTIAL
The original objective of Project 8.4-1 was to evaluate the
attenuaticn, by an operational fog-oil smoke screen, of thermal radiation
resulting from the detonation of a nuclear device, and to secure data to
verify theoretical calculations on the above currently being developed
under contract to the Chemical Corps.
WNAQ
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