Radiological Safety Regulations CJTF SEVEN No 3-53 calculating allowable exposures under both tactical and operational conditions, (5) All persons in aircraft at shot time or at subsequent times when engaged in operations 1n or near the cloud or RADEX track shall wear film badges. (6) Crew members of aircraft in the air at zero hour will take special precautions to avoid (for at least 10 seconds) the direct and réflected light resulting from the burst. At the discretion of the airplane commander this could be done with protective high density goggles, by turning away from the burst with eyes closed, by covering the eyes with the forearm, by turning cockpit lights up tc highest intensity or by any combination of the above. e. In e2r and water the following continuous levels of radioactivity are considered safe from the standpoint of personnel drinking and preathing (uc=microcurie): Water Beta-Gamma Emitter 5 x lO~> uc/ec (calculated to H / 3 days) Air (24 hour average) 6 Particles less than 5 micron diameter 107° uc/ec Particles greater than 5 micron diameter 107-4 uc/cc 18, In tactical situations the military commander mist make the decision regarding allowable exposures, As military personnel are normally subject to only randum expesure, health hazards are at a minimum. Current Department of Defense information on exposure to gamma radiation in tactical situations is indicated below: a. Uniform acute (immediate) exposure of 50 roentgens to a group of Armed Forces personnel will not appreciably affect their efficiency as a fighting unit. b. Uniform acute exposure of 100 roentgens will produce in occasional individuals nausea and vomiting but not to an extent that will render Armed Forces personnel ineffective as fighting units. Personnel receiving an acute radiation exposure of 100 or more roentgens should be given a period of rest and individual evaluation as soon as possible. c. Uniform acute exposure of approximately 150 roentgens or greater can be expected to render Armed Forces personnel ineffective as troops within a few hours through a substantial incidence of nausea, vomiting, weakness and prostration. Mortality produced by an acute exposure of 150 roentgens will be very low and eventual recovery of physical fitness may be expected. d. Field commands should, therefore, assume that if substantial numbers of their men receive acute radiation exposures substantially above 100 roentgens there is a grave risk that their commands will rapidly become ineffective as fighting units. e, Internal radiation hazards caused by entry of radioactive substances through the mouth, through the lungs or through cuts or wounds do not exist after an air burst. Internal hazards following a contaminating surface explosion may be avoided if ordinary N-I-6