TG 7.4 RADIOLOGICALSAFETY REGULATIONS 1. 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 twenty (20) roentgens, gamma only, is authorized for crew members of air sampling aircraft. The maximum permissible exposures as stated above are applicable to a field experimental test of nuclear devices in peacetime, 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 redwe 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. 2. 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 ad exit from contaminated areas will be via Rad-Safe check points only. 3. Contaminated land areas of intensities greater than one hundred (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 Rad-Safe Officer, TG 7.1. Rad-Safe clothing and equipment will be issued to the personnel. 4. Contaminated land areas of intensities less than one hundred (100) mr/hr and greater than ten (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. 5. Contaminated land areas of intensities less than ten (10) m/hr will be considered unrestricted from a Rad-Safe viewpoint. Areas coming within this limitation will be designated specifically by Comdr. JTF SEVEN prior to unrestricted entry. 6. Rad-Safe monitors assigned to individuals or groups working in contaminated areas or with contaminated equipment during recovery operations will act in an advisory capacity to keep the recovery party leader informed of radiation intensities at all times. The recovery party leader is ex- pected to accept this advice and act accordingly. It is the responsibility of both the leader and the members of the recovery party to adhere to the limits established in these regulations. . 7. Film badges, dosimeters and protective clothing (coveralls, booties, caps, gloves, dust respirators, etc) as deemed necessary will be issued to personnel entering contaminated areas by the Test Aircraft Unit Rad-Safe supply section. 8. All personnel within viewing distance of an atomic detonation who arenot supplied with protective goggles will turn away from the detonation point and close their eyes during the time of burst. At leastten seconds should be allowed before looking directly at the burst. classified TASK GROUP 7.4 OPRS ORDER NO. 1-53 ANNEX H, APNDX 1 _D DIR 5200.18, Declassified OP OR 5200.10