Further in 1965, it was stated that: Although radiation doses numerically equal to the RPC's may impose a risk so small that they can be accepted each year for a lifetime if there is significant benefit from the programs causing the exposure, they do not and cannot establish a dine that is safe on one side and unsafe on the other. Rather, some risk of injury may exist at any level of dose and the risk continuously increases with dose. Caution should be exercised in decisions to take protective actions in situations where projected doses are near the numerical values of the RPG's since the biological risks are so low that the actions could have a net adverse rather than beneficial effect on the public well-being. (30 F.R. 6953) Thus, in carrying out its programs, the Department of Interior can, without violation of Federal Guides, allow the possibility of occasional Indivicualdoses in excessof 0.5 rem/yr, provided it has carefully considered the reason for doing so. If further information is required, please contact Dr. William A. Mills of my staff for assistance. Sincerely yours, (Sf David M. Rosenbaus Deputy Assistant Administrator for Radiation Programs (ANR-958) ec: ‘Dr. Bruce Wachholz, DOE 5001608