ae.
survey at the end of July 1956, a dose rate of 0.1 mr/hr would
be anticipated.
However, the survey of Rongelap Island at the
end of July 1956 showed a range of values from 0.2 - 0.5 mr/hr,
with an average of 0.4 mr/hr.
The higher value found at the
time of the survey is undoubtedly due to the small additional
fallout that occurred during Onreration REDWING.
is relatively fresh radioactive material,
Since this
the decay will be
more rapid so that the dose rates on Rongelap Island at the
time of repatriation should be less than 30 milliroentgens/week.
8. The maximum permissible external gamma exposure to
adult workers recommended by the National Committee on Radiation
Protection is 0.3 roentgens/week with an added restriction
that the maximum permissible accumulated dose, in rems at any
age is equal to five times the number of years beyond age 18,
provided no annual increment exceeds
15 rem
(this applies to
all critical organs except the skin, for which the value is
double).
The maximum permissible exposure for the population
as a whole from all sources of radiation,
including medical
and other man-made sources, and background shall not exceed
14 million rem per million of population over the period from
conception up to age 30.
It is difficult to extrapolate
precisely far into the future, but the data suggest that the
gamma doses on Rongelap Island would not greatly exceed
at all)
(if
0.5 roentgens for the first year of reoccupancy, with
lesser doses in subsequent years.
9. The gamma dose rates on other islands of Rongelap
Atoll have not been followed as closely as on Rongelap but
the data suggest the relative dose rates now are the smallas
measured in the first part of March 1954;
~T—
i.e.
the highest
Department of Energy
yistorian’s Off10® Appendix "A"
DRCHIVES
as ey