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12/3/79
Mrs. Ruth G. Van Cleve, Director
Office of Territorial Affairs
U. S. Department of the Interior
Office of the Secretary
Washington, D.C.
20240
Dear Mrs. Van Cleve:
Reference is made to your letter of October 22, 1979,
in which
you state that the Department of the Interior is considering the
agricultural redevelopment of Enjebi Island and the reestablishment
of a commmity on that island for the Enjebi people.
As part of
this consideration you requested estimates of the time which must
elapse before exposure levels on Enjebi Island would meet exposure
limits.
Current estimates of the number of years which must pass if exposure
limits are to be adhered to are based upon the potential dose estimates
provided in the Preliminary Dose Assessment Report prepared by the
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staff of the Lawrence Livermore Laboratory (LLL). fhese dose estimates
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have been compared to tHe exposure gufdance;-and, based upon known ~
ot
radioactive decay Yates of“the radionuclides involved, time intervals
have been:calculated.
U. S$. Federal Radiation Council recommended
exposure levels (adopted also Pyce Enviroqmental Protection Agency)
invididual ‘in any. one. year Cand
¢
are 500 «avem tothe,maximum exposed.
assumes“that the naximanexposed individual does not vary ‘from.the
average population exposure by. more than a3 factor‘of 3, resulting in a
recommended average population. exposurelevel of2170 mre “peryear)
and 5000 mrem over a 30 year period.
Atomic Energy Commission
recommendations, recognizing the uncertainties inherent in ‘such
guidance for the maximum
dose estimates, were one-half of the FRC
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