-- RETYPED COPY -HEADQUARTERS, Joint Task Force SEVEN Washington 25, 20 June 1953, Appendix to Annex I Radiological Safety, CUJTF SEVEN Operation Order No. D.C. 1600 R 1~53 RADIOLOGICAL SAFETY REGULATIONS l. The Maximum Permissible Exposure (MPE) for personnel involved in this operation is 3.9 roentgens, gamma only, unless reduced because of previous or anticipated future exposure. All exposure to external gamma radiation will be regarded as total body irradiation. Special MPE of 20 roengtens, gamma only, is authorized for crew members of air sam-~ pling aircraft. The maximum permissible exposures as stated above are applicable to a Field experimental test of nuclear devices in peace- time, wherein numbers of personnel engaged in these tests have been previously exposed or will be continuously exposed to potential radiation hazards. It may become necessary from a study of personnel records to reduce the MPE for certain individuals who have participated recently in other atomic tests. Under a military tactical situation or emergency the maximum permissible exposures above do not apply. All atoll land and lagoon areas in or near which a detonation takes place will be considered contaminated until cleared for operations by the task force commander. Entry to and exit from contaminated areas will be via RadSafe checkpoints only. Contaminated land areas of intensities greater than 100 mr/hr will be delineated as such; Personnel entering these areas must be accompanied by a monitor and will be subject to clearances by the RadSafe Officer, TG 7.1. RadSafe clothing and equipment will be issued to the personnel. Contaminated land areas of intensities less than 100 mr/hr and greater than 10 mr/hr will be controlled areas; Personnel entering these areas will be subject to clearance by the RadSafe Officer of TG 7.1. Monitors will not be required for entry into these controlled areas. Contaminated land areas of intensities of less than i0 mr/hr will be considered unrestricted from a RadSafe viewpoint. Areas coming within this limitation will be designated specifically by CJTG SEVEN prior to unrestricted entry. RadSafe monitors assigned to individuals or groups working in contami-~ nated areas or with contaminated equipment during recovery operations will act in an advisory capacity to keep the recovery party leader 440