8/8/2019 Beta Doses From Fallout on Skin Mikhail
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AccessionNumber :AD0888503
Title : Beta-Radiation Doses from Fallout Particles Deposited on
the Skin.
Descriptive Note : Final rept., 17 Apr 70-30 Jun 71,
Corporate Author : ENVIRONMENTAL SCIENCE ASSOCIATES FOSTER CITY
CA
Personal Author(s) : Mikhail, Saad Z.
Report Date : JAN 1971
Pagination or Media Count : 105
Abstract : Absorbed beta-radiation dose expected from fallout
particles deposited on the skin wasestimated by use of the Beta
Transmission, Degradation and Dissipation (TDD) model and a
Condensed-State Diffusion-Controlled model that describes the
mechanism of fission-productabsorption in fallout. A fission
density of 10 to the 15th power fissions per cubic centimeter of
falloutmaterial was assumed. Comparison of computed doses with the
most recent experimental data relativeto skin response to
beta-energy deposition leads to the conclusion that even for
fallout arrival times asearly as 1000 seconds (16.7 minutes
post-detonation), no skin ulceration is expected from
singleparticles 500 micron or less in diameter. Absorbed gamma
doses calculated for one particle size (100microns) show a
beta-to-gamma ratio of about 15. Dose ratio for larger particle
sizes will be smaller.Doses from arrays of fallout particles of
different size distributions were computed, also, for
severalfallout mass deposition densities; time intervals required
to accumulate doses sufficient to initiate skinlesions were
calculated. These times depend strongly on the assumed
fallout-particle-size distribution.Deposition densities in excess
of 100 mg per square foot of the skin will cause beta burns if
falloutarrival time is less than about three hours, unless the
particles are relatively coarse (mean particlediameter more than
250 microns). (Author)
Descriptors : *FALLOUT, BETA PARTICLES, BIOLOGICAL ABSORPTION,
RADIATIONDOSAGE, SKIN(ANATOMY), FALLOUT, RADIATION EFFECTS, GAMMA
RAYS,DEPOSITION.
Subject Categories : RADIOBIOLOGY
Distribution Statement : APPROVED FOR PUBLIC RELEASE
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on the Skin.
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