e. In air and water the following continuous levels of rag ioactivity are considered safe from the viewpoint of personnel drink ng and breathing (uc mMicrocurie): Beta or Gamma Emitter Water Air 5 x lo7~3 uc/ce (calculated to H + 3 days) (24 hour average) Particles less than 5 micron diameter 1076 uc/cc Particles greater than 5 micron diameter 1074 uc/cc 18. In tactical situations the military commander must make tt decision regarding allowable exposures. As military personnel are normally subject to only random exposure, health hazards are at a inimum. Current Department of Defense information on exposure to mma radia- tion in tactical situations is indicated below: a. Uniform acute (immediate) exposure of 50 roentgens to Armed Forces personnel will not appreciably affect their a fighting unit. b. Uniform acute exposure of 100 roentgens will produce i individuals nausea and vomiting but not to an extent that Armed Forces personnel ineffective as fighting units. Pe group of ficiency as occasional ill render ceiving an acute radiation exposure of 100 or more roentg given a period of rest and individual evaluation as soon possible. greater c. Uniform acute exposure of approximately 150 roentgens can be expected to render Armed Forces personnel ineffecti e as troops within a few hours through a substantial incidence of nau a, vomiting, weakness and prostration. Mortality produced by an acute 150 roentgens will be very low and eventual recovery of p ness may be expected. d. Field commanders should, therefore, assume that if subs antial numbers of their men receive acute radiation exposures subst tially above 100 roentgens there is a grave risk that their commands wi 1 rapidly become ineffective as fighting units. e. Internal radiation hazards caused by entry of radioacti through the mouth, through the lungs or through cuts or wo exist after an air burst. Internal hazards following a co surface explosion may be avoided if ordinary precautions a Only under unusual circumstances will there be internal ha residual contamination. This eliminates the necessity for consequent reduction of tactical efficiency. 19. The RadSafe Officer, TG 7.1, will maintain standard type f records of radiation exposures for all task force personne will indicate full name, rank or rate, serial or service n applicable, organization, home station or laboratory, date Sure, approximation duration of over-exposure in hours and 457 e substances nds do not taminating fe taken. rard from masking and LIm badge - Records ber, if of expominutes