HEADQUARTERS, Joint Task Yorce SEVEN Washington 25, D. C. 10 November 1953 Appendix I to Annex N Radiological Safety, CJTF SEVEN Operation Plan No. 3-53 RADIOLOGICAL SAFETY REGULATIONS General a. Radiological Defense (RadDefense) operations or Radiological Safety (RadSafe) operations, short term RadOps, are general terms. They are used to denote the means by which a unit can control and cunfine the damage and radiological effects of an atomic explosion or of radioactive material spread by other means, thereby preventing and avoiding health hazards to personnel. They are interpreted to include measures such as training, organization, distribution of radiological personnel, development of techniques and procedures, use of detecting equipment, protection or removal of exposed personnel and decontamination of personnel, structures and equipment. b. Following each detonation there will be areas of surface radiological contamination and areas of air radiological contamination. These areas are designated as Radiological Exclusion Areas (RADEX). Prior to shot times, the forecast air and surface RADEX will be disseminated by CJTF SEVEN in the target area. These RADEXES will represent a forecast from H Hour until dissemination of a later surface and air RADEX at about H plus 4 hours. The later RADEXES will be based upon the master radiological "situation map" maintained in the RadSafe Office of CJTF SEVEN: Since the air RADEX after shot times will be based on monitored tracking by aircraft over significant large ocean areas, information promulgated from the forecast air RADEX may have to be extended beyond the originally anticipated 4, hour period. , c. The surface RADEX will be determined by actual survey with Radiation Detection, Indication and Computation (RADIAC) equipment after shot time. The most rapid method of accomplishing surface survey in the early stages will be by helicopter flight in and aroud the surface of contaminated areas, From the radiation intensities measured at a known altitude, it is possible to obtain an estimate of the radiation dosage rates which would be encountered on the surface of the ground or water. Actual water samples from the lagoon will also be utilized. Ground survey will follow these guides to determine definitely the contaminated regions and objects, Formal ground survey of the shot atoll, as feasible, will be accomplished on H plus 24 hours. The Maximum Permissible Exposures (MPEs) and Maximum Permissible Limits (MPLs) as stated herein are applicable to a field experimen- tal test of nuclear devices in peacetime wherein numbers of personne] 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 recently been over-exposed to radiation. Further, the MPEs and MPLs are subject to revision by waiver from the task force commarder in individually designated cases when circumstances indicate the need and justification therefor. 3. Due to the special nature of field tests it is considered that a policy of strict adherence to the radiological standards prescribed N-I-1