FEDERAL REGISTER Wednesday, May 28, 1960 plies when the individual whole body dosts are known. As an opcrational techniquc, where the individual whole boy doses art mot known, a suitable sample of the exposed ponulation should be developed whose protection guide for annual whole body dose wil! be 0.17 rem per capita per year. It is emphasized that this is an oprrationa) technique which should be modified to mect spe‘ elu) situations. (2) Considerations of population re- _ Hetics impose a per capita dose limitation for the gonads of 5 rems in 30 years. ‘The operational mechanism described above for the annual individual whole body dose of 0.5 rem is likely in the im‘gnodiate future to atsure that the gopadal exposure Guide (5 rem in 30 years) is not excecded. (3) These Guides do not differ substantialis from certoin cther recoramendations suchas those made by the National Committee on Radiation Protection and Measurements, the National Academy of Sciences, and the International Commission on Radiological Protection. (4) The term “maximum permissible dose" is used by the National Committee on Radiation Protection (NCRP) and the International Commission on FaGiological Provection (ICRP). However, this term is often misunderstood. The words “maximum” and “permissible” both have unfortunate conno:ations not intended by either the NCRP or the ICRP. 45) There can be no Single permissibie or acceptable level of exposure without regard to the reason for permitting the exposure. It should be general practice bo reduce expitsure to radiation, and pos- itive effort should be carried oui to fulfill the sense of these recommendations. It is basic that exposure wo radiation ine them at this time. However, current protcetion ruides used by the arcncics appecrr appropriate on an intcrim basis. It is reconunended that: 5. The term “Radioactivity Concen- tration Guide” be adopicd for Fudcral use. This term ts defined os the concentration of radioactivity in the environment which is determined to result in whole body or orran doses cqual to the Radiation Protection Guide. Within this definition, Radioactivity mended are herein mppropriate for recom- normal peacetime operations. (7) These Guides are not intended to apply to radiation exposure resulting from natural backrround or the purposeful exposure of patients by practitioners of the healing arts. (8) It is recozni-cd that our present - gcientific knowledse does not provide a firm foundation within a factor of two or three for selection of any parcicular a] numerical valve in preference to another \ value, 3t should be recovnized that the + Radiation Protection Guides recommended in this paper are well below the VL level where biolocical damage has been observed fn humans. Jt is recommended that: 4. Current protection euidecs used by the agencies be continiicd on an interim basis Jor organ doses © (he population. Reconmendations ore not made concerning (he Fadiatinn Protection Guides for individual orfnn doses to Unc popue Intion, other than the ronads. Unfortunately, the complexities of establishing fuides applicable to radiation exposure ef nll body ormans preclude the Couneit from making recommendauons concerns JO0Tub2- approved for °.. Mar 13, 1960. {[P.R. Doc. 00-4539: Filed, May 27, 19°: 6:51 am] 6. The Federal agencics, as an interim ommended Radiation Protection Guides. Where no Radiation Protection Guides gre proviced, Federal agences continue Present practices. No specific numerical recommenda- tions for Radioactivity Concentration . Guides are provided at thistime. How- ever, concentration guides now used by the agencies appear appropriate on an interim basis. Where appropriate radioactivity concentration guides are not available, end where Radiation Protection Guides for specific organs are pro- vided herein, the latter Guides can be used by the Federal agcncies a5 a start- ing point for the derivatvon of radioactivity concentration guides applicable to their particular probiems. The Federa) Radiation Council has also initiated action directed towards the development of additional Guides for radiation protection. . 2° -S recommended that: attainment of the desired coal of protect- Guides are Guidance of Federal agencics, ane | memorandum shall be pubished ip 1:. FEpeRAL REGISTER. Dwicur D, Eisexzowrr Measure, use radioactivity concentration guides which are consistent wilh the rec- Protection Guides with different numerfcal values, dependins upon the circumThe memorandum the use of its correspondins Radiation Protection Guide is appropriate. Itis recommended that: ~~ Radiation Protection Guides with juds- stances. The recommendations numbered "*' throurh “7" contained in the ot: Concentration Guides can be determined after the Madiation Protection Guides are decided upon. Any given Radioactivity Concentration Guide is apphcabie only for the circumstances under which should result {rom a rea! determinction of its necessity. (6) There can be different Radiation 4}¢ 7. The Federal agencies apply these ment and discretion, to assure that reasonable probability is achieved in the ing man from the undesirable eflects of Tadiation. The Guides mav be exceeded only after the Federal ceeneys having jurisdiction over the matter has carefuliy considered the reason for doing so in light of the recommendations in this paper. The Radiation Protection Guides provide a gencra! framework for the radiation protection requirements. It is expected that each Federal anency, by virtue of its bmmediate knowledze of its operating problems, will use these Guides as a basis upon which to develop detailed standards tailored to mect Its particular requirements. The Council] will follow the activities of the Federal asencics in this aren and will promote the necessary coordination to achieve an effective Federal program. If the foregoing recommendations are approved by you for the ruidance of Frderal arenrics in the conduct of their radiation protection activitics, it ts further recommended that this memorandum be published tn the FrEperan Reco1stTer, Agmitr S. PLeatmine. Chairman, Federul Radiation Council. ws eee ee ae