SHIELDING FROM RADIATION

SHIELDING FROM RADIATION
Exact figures on the thicknesses of various substances to
provide complete or partial protection from the effects of
radiation in relation to the distance from the center of explosion,
cannot be released at this time. Studies of collected
data are still under way. It can be stated, however, that at a
reasonable distance, say about 1/2 mile from the center of
explosion, protection to persons from radiation injury can
be afforded by a layer of concrete or other material whose
thickness does not preclude reasonable construction.
Radiation ultimately caused the death of the few persons
not killed by other effects and who were fully exposed to
the bombs up to a distance of about 1/2 mile from X. The
British Mission has estimated that people in the open had a
50% chance of surviving the effects of radiation at 3/4 of a
mile from X.