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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 community 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 guidance 5 rand, based spon known «
radioactive decay rates ofthe radionuclides involved, time intervals
have been calculated.
U.
S$. Federal Radiation Council recommended
exposure levels (adopted also Pyee .Envirogmental Protection Agency)
didual ‘in any, one. year (and
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are 500 vem tothe,maximum exposed.invi
assumesthat thesaximun exposed individual does not vary from the
average popylation exposure by. more than a factor of 3, resulting ina
recommended average population exposure level of170 mrem per year) |
and 500mrem 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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