sbout 52 tine: lese than the maxinun
permiszible azsount.
Norma) facters of
dilution by additional reinfell and/or by the influx of lesser contaminated
k frgt Tet
ground water vould. reduce the level of activity.
dix
Considerable effort has and is being made to evaluste hazards fron
sirborne radioactive materials, including fission products.
There are eer-
tainly many unansvered problezs including the possible basard frem a aingle
particle in the lungs.
Despite the uncertainties and as yet incesplete
analysis of the inhalation hazard, the mreponderance of evidence today is
that the external gamma hazarc fron fallout is the more
the twot.
liniting factor of
(However, see discussion on food contanination.)
During Upshot-Knothole quite complete data were eollected of concentrations of airborne activity en about 150 occasions in some 40 different
localities within
200 miles of the Fevada froving Grounds,
monitoring of all detonations.
These included
Histograms were nade of air eoncentrati ons
vercus tine efter detonation for 30 eecasions and estimates were sade of
deses to the lungs.
DOE/NV
These data for the five communities showing the highest
alr coucentrution are given in Table Vi.b.
The histogram for St. George (the
et
high[ats hour average concentration of fallout ever measured in a populated
aren) 43 reproduced in Appendix J.
#Acd Hoc Comittes Meeting.
Washington, D.C,
January 20, 1954.
Ue ACC rien
Meek
oe
4A