-3-
HW-80991
An individual with such habits could conceivably take in enough radioactive
material of Hanford origin (mostly p34) to supply about 45% of the annual
permissible amount.
tive.
In this case the bone is the organ that is most restric-
This same individual could also take in enough Sr 90 of world-wide fall-
out origin to equal about 5% of the permissible amount-morethan twice that
estimated for 1962.
The exposures from nuclides of Hanford origin and
from fallout are not additive in relation to limits, however, since the Radia-
tion Protection Guides recommended by the Federal Radiation Council are
not applicable to fallout from weapons tests.
The amount of yi3!
in the Hanford environs was substantially less
than in the previous 2 years when extensive testing of weapons was in progress
.
of
the I
Nevertheless, world-wide fallout continued to be the dominant source
131
found locally, except for the month of September when abnor- :
mally large amounts were released from one of the chemical separations
131 in milk from local farms could
plants. For the calendar year 1963, the I
have resulted in radiation exposures to the thyroids of infants of approximately 10% of the Federal Radiation Council Radiation Protection Guide.