A high degree of correlation was found between the thymic weight loss in
mice and the dosage of x radiation over the range of 75 to 900 r. Splenic
weight loss proved satisfactory as a biological indicator over the range of
150 to 600 r. The response of mice splenic and thymic net weight to the
mixed radiation in a thermal neutron columm was found to be qualitatively
the same as that seen following exposure to x radiation. The relationship
of chromosome breakage frequency to radiation dose in the flowerihg plant
Tradescantia
(spiderwort)
was determined for three experiments designed to
simulate anticipated field conditions for atomic explosions. Studies are
reported which were made to provide control x-ray dose-mortality data for
atomic
comparison with field montality data obtained from mice exposed to
bomb nuclear radiations. Mean survival times and the pattern of deaths as a
function of dose and time are presented and discussed. Lethal dose curves
established for 110 to 160 1b swine exposed to 2,000 kvp total-body x
radiaation at 2 m indicate that bilateral (one-half the total dose to each
lateral aspect) irradiation is more lethal than unilateral (total dose to
one lateral aspect) irradiation. The dependence of dose distribution on
method of x radiation and wave length, the importance of uniform dose
distribution,
and the difficulties encountered in obtaining uniform dose
distribution in a subject 28 cm thick are discussed. From a study of the
effects of exposure of swine to tropical conditions for a period of several
hours in metal containers similar to those used for exposure during
Operation Greenhouse it was concluded that the confinement did not affect
Significantly the response of the animals to irradiation. Lethal dosage
determinations and pathological effects of various doses of bilateral
total-body x irradiation on dogs are reported. Data indicate that
confinement of dogs for several hours in Ai cages under conditions similar
to those used at Operation Greenhouse did not affect significantly the
response of the animals to irradiation.
(C.H.)
CHROMOSOMES;
BODY;
BIOLOGY;
ANIMALS;
ALUMINUM;
Descriptors:
MICE
LOSSES;
LETHAL DOSE;
IRRADIATION;
FREQUENCY;
DOGS;
DISTRIBUTION;
RADIATION DOSES;
PLANTS;
PLANNING;
NUCLEAR EXPLOSIONS;
NEUTRONS;
*
xX
WEIGHT;
VESSELS;
THYMUS;
THICKNESS;
SWINE;
RADIATION INJURIES;
RADIATION
Subject Codes (NSA): GENERAL AND MISCELLANEOUS
10/5/163
(Item 163 from file:
187312
NSA-16-011356
109)
PART 1.
INSTRUMENTATION FOR STRUCTURES PROGRAM.
ANNEX 3.4 OF
DIRECTOR'S REPORT OF ATOMIC WEAPON TESTS AT ENIWETOK, 1951
SCIENTIFIC
Northrop, P.A.
Sandia Corp., Albuquerque, N. Mex.
Publication Date: Jan. 1951
144 p.
Primary Report No.: WT-1
Note: Operation GREENHOUSE
Journal Announcement: NSA16
Document Type:
Report
Language: English
™
Instruments are described which were used to measure the blast effects on
the structures during Operation Greenhouse. Measurements made on buildings
included air pressure, acceleration, displacement, strain, earth pressure,
footing pressure, and time-of-break measurements. In additson Stimascope
(sound-time-in-materials), tests, Whittemore strain gage tests, surveying
measurements,
and natural period of vibration measurements,
were made
before, and repeated after, the blast. The magnitude of the task limited
the type of end measurements to the simplest that would give adequate
information. Availability, cost, and ease wlth which gage responses could
be remotely recorded on magnetic tape, were also controlling factors in the
selection of the instruments used. A list of the equipment, photographs,
diagrammatic drawings and wiring circuits, and data from preliminary tests
of the equipment are included. (C.H.)
Descriptors:
AIR;
BUILDINGS;
CIRCUITS;
CONFIGURATION;
DEFORMATION;
EARTH;
ECONOMICS;
ELECTRONICS;
GAGES;
INSTRUMENTS;
MEASURED VALUES;
PHOTOGRAPHY;
PRESSURE;
RECORDING SYSTEMS;
SHOCK WAVES;
SOUND ;
TESTING;
VELOCITY;
VIBRATIONS
Subject Codes (NSA): GENERAL AND MISCELLANEOUS
5()(}35 11