cadeubiting allowable exposures under beth tactical anc operational -itions. .5) All persons in aircraft at shot time or at subsequent times when engaged in operations in or near the cloud or RADEX track shall wear fila badges. " 6) Crew members of aircraft in the air at sero hour will take special precautions to avoid (for at least 10 seconds) the direct ~and reflected 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 foreara, by turning cockpit lights up to highest intensity or by any combination of the above. e. In air and water the following continuous levels of radicactivi- ty are considered safe fromthe standpoint of personnel drinking and breathing (uc = microcurie): Water Beta-Gamma Emitter 5 x 10°) uc/ee (calculated to H ¢ 3 days) Air (2, hour average) ~4 Particles less than 5 micron diameter 10 ue/ec Particles greater than § micron diameter LOm4 uc/cc 18. In tactical situations the military commander mist make the decisioa regarding allowable exposures. As military personnel are normally subject to only randum exposure, health hazards are at a ainimus:: Current Department of Defense information on exposure *o gama radi~ ation in tactical situations 4s indicated below: a. Uniform acute (immediate) exposure of 50 roentgens to « group of Armed Forces personnel will not appreciably affect their efficiency as a fighting unit. b. Uniform acute exposure of 100 roentgens will preduce in occasicn~ al individuals nauses and vomiting but not to an extent that will render Armed Forces personnel ineffective as fizhting units. Person- nel receiving an acute radiation exposure of 100 or more rcentgens should be given a period of rest and individual evaluation as soon as possible. ¢. Uniform acute exposure of approximately 150 roentgens or greater can be expected te render Armed Porces 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 recevery of physical fitness may be expected. ad. Wield commands should, therefore, essume that if substantial numbers of their gen 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 radtation hazards caused by entry of radicactive sub~ stances through the mouth, through the lungs or through cuts or wounds do not exist after an air burst. Internal hazards following @ contaminating surface ola may be avoided if ordinary 7 aetet: