swee; 4 to 6 cycles per second.
The probability of « particle remaining
within one millimeter sone for aa much as one-half hour appears to be
vanishing small. ... Protection will also be provided by the muous
lining which 4s itself renewed several times an hour."
Accepting the
estinates above and rad metbods illustrated in appendices E and F, it nay be
conyuted thet about $3 reps would be delivered to the surface ef an
imaging
ary stationary sphere one millimeter ts radius by a 20 micron particle (@¢.2°
steromerts)"ge doses Liat ‘be detivered closer to the particle but
with the relatively rapid movement of the particle, it does net
that large doses will be delivered tc a great muxber of cells.
appear
Maltiple
ex;osures might oecur from efiitional particles but again this risk 4s
difficult to evaluate.
Food
Considerable effort is being directed toward the study of eontam
ination of food froz fallout. One element of major concern is Sr™, It
has been estimated thet if one vere to subsist entirely onbyeeon froz
sceils containing about, one xicrocurle per square foot of Sr
(1,000 pounds
of ealciun per acre}, that over a period of years there would accwmlate in
the huran skeleton a body burden of one xicrocurie of Sr°*, Soils taken
fror.
®
about
Files fron the Nevada froving Grounds, now show a concentration
of
microcuries per square foot.
*irivate communication, L. 4. Dean, U. 5. Departnent of agriculture,
Beltsville, Maryland, April 23, 195...
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