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Mrs. Ruth Van Cleve Director, Office of
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Territorial Affairs
Department of Interior
Washington, D. C. 20240
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Dear Mrs. Van Cleve:
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During meetings held in your office on May 17 with Messrs. Ted Mitchel]
and Earl Gilmore, and on July 6 with Dr. Hugh Pratt, I commented upon
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the general subject of U.S. radiation exposure criteria and its relation-
ship to the Enewetak resettlement. Subsequent to the May 17 meeting,
I sent copies of appropriate portions of Federal Radiation Council (FRC)
documents to you. The matter also was discussed in our letter to you
of May 15, 1979, re the Bikini/Eneu situation.
I would, however, Tike
to elaborate a bit on this subject.
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The FRC recommended that, for the general U.S. population, the individual
should not receive over 500 millirem per year to the whole body or to the
bone marrow.
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The FRC also recommended that "...every effort should be
made to encourage the maintenance of radiation doses as far below this
guide as practicable." In the absence of knowledge concerning the
radiation exposure received by the individual, the FRC "...introduced
as an operational technique, where individual whole body doses are not
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known, the use of a 'suitable sample' of the exposed population in which
the guide for the average exposure of the sample should be one-third the
(guide} for individual members of the group," (i.e., that it is reasonable to assume that the individual would not vary from the average by a
factor greater than 3). Therefore, the FRC indicated that the average
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exposure for a suitable sample of a population should not exceed 170
millirem per year, assuming that individual exposure Tevels are not known.
In addition, to protect the genetic pool of the U.S. population (i.e.,
"Considerations of population genetics..."}, the FRC recommended “...a
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per capita dose limitation for the gonads of 5 rems (i.e., 5000 millirems ee
in 30 years.” The whole body dose was considered to be the equivatent of
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DOE FORM AD-95 (1277)
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