fltCeew Sss:39g 4 Abdstract of Talk to be Given by or Joho So Lawer ceme ae On sucust 13, 1 oL8 CHE TRPLOTS OP P/SOEATICN CN NEMOPOT esis John S, Laverence, ME. Professor cf Medicine, Conuol of Mediedi.z, U.C.L. A genstuerntion of the effects of radiation on the blesd-forming tissues trings one inte 2» controversial field. Varying modes of anzlication, varying physical prenemies tn cifferent types of radietaon, and varying effects in differert animal g1eclec ctucied have resulted in ccnfusion. The extent, locution, end type of injury 5 Dlood-ferving tissucs dependant upen these and ovh-r complicating fectors, these cuences are often quantative rather than cua itative. The remrke tesay summarize oor present experiences with wha effect ,bloodmlcrlng tissues, sis Sie wit. studies OuNar fossa a2 revit vSTe: cave Fing (eroye and germs rars, Fortunately, Tie dt®reported deal S peciel ef.ects peculiar to certain tip ocumhn as elphs, tete and inwornel vodiction will be mentioned S2Cl ewlele fa whies cicvussion, we shall consider the effects of rodiation » hen ade Tr Neus far Uhe foliovine wane 2, Cingle dees to the whéle body as a whole Pe hepeated small deszs to the body az a wrole 3o Single o> repeated cosec to one orca fe iInternsl radiation Sinzle Doses of Roentren Radiation ty the Body as a “hole ay way of introduction,much confusion will be avoided in considering vocjavicn Jifscts on the wlooe-forming tissues of the following fucss are recognized: The adult cells in the circulating bleod ars very resistant to damace by radintion. It is the young, psrent cell types in bone marrow and lymphoid tiesucs which ace thes precursors of the circulnting celis which ar a zo sensitive to. vadiation Ankurys