The ecntreal radiobiological ,rctlem axzwerrble only by acturl bomb tests is whether or not the various kinds of blolosiesl effects cen be eccounted for from e knowledge of the amounts and kinds of redicticns and their distribution in spece and time. This presup.cses rather complete information ebout the fluxes of neutrons end gamme reys 3% verious points end the energy distribution of these raciztions. faces. te iiferiy: tien of this nature does not now exist, hence any proguem of tlolsgiell investig¢ tion» c V murt be in close per:Jlelisn with the necesser, iueteccal-tlon program : ef the physicists to determine the above fluxes at points vhere biological exnosure is carried cut. Tests which have been tricd and found to be not emenabtle to quantitetive | anelyeis or which ere difficult to carry out in a setisfactory menmner under field conditions will. be omitted from this diecussicn. Only te ts wrich cxrnot be duplicated under laboretory conditions anc which show : noritive useful results will be discussed in this proper. Lracice of fe te the Cetelis E of biological exposure, these shculd be cerried evt with a Pa: ditterent4 scecies of test orgaiisms whose reccetions to the corre.eab mw liv iic us La now well understood. ‘hese orgenisrs are few in nuro ey at this vine anc will be hereafter referred to as "celibrated" test srecies. Furcthcr, adeauete ecsilities end skilled personnel will be en absolvte necessity in the inmedinte ry r vicinity of the test area. It gees without seying thet wnless the liaison between instrument test sections and biologists is venrly _erfect the tests will heve little biological significence., As will be -ocinted out lever, certein of the blologicel work pro osed will provide checli: points on the physical neasurements to be done by the physicists. From data collected under such conditions, one might hope to determine whether the ion saturction effects resultent from the heavy Lonization at SECRET

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