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Sec tim Head The personnel of next year ' s Sp?CtrOSCOpy section is n w engaged in two (problems (1) Studylrg the distribution of uranium in rabbit r,part l cul n rly bone storage after oral ma lunz ad miz l st ration, (2) endeavoriG t o obtain as large uranium az# lead storage In bsne a? pas ui ble far co2perative x-Fey diff rec tim if these elements ere stored bp repleca-?ent in the apatite lattic of bone md if tteyE. t?.e positions that uranium and lead atoms occqy in the miters1 lattice. I t is hoped vith the x-rx' diffraction technique t o deternine To this sect ix will fall the fdl ov nc duties. (1). Cone tru c tion and ms in ten ance of in st nu en tef w th9 divlhioa of red.3lD ge at biophysics. suu err is lon PnC res sons i3ili ty for ra dlc act lv it y aeesurerwntu In this division. (?). Cut11this duty Is transferred outside the division,resp on sl bil it r for the industrial monitoring progren: n;u carried aut 0.v the divisi sn 3: spec id problem. It will 3e the Outy of this section to extend animal tracer studies dlrae.dy under w a y with polonium, radium end uraniwc. personnel of this division w l ll carry out the planned human tracer studies with plutonium, radlum, polaaium and uranium. Coopsteting with rect lon eight, the Also in the Jurisdiction of this section will 30 the c err ying aut of any metabolic rtudles rN uea ted 3p the district o r its successor In the future. In colla b met l mw l th the inrtrumentation section, experimental at t hods will be developeC for the & ? pli cation of radioactive iso tz pes produced by the Uranium Pile t o basic biological ani medical problems, both of the Manhattan proJect acd of the more general fields of biology Lnd sed i cine. I n tkirr s cc tia a,It 16 propose& t o cerry out: (e.) chronic and acute redic.ticn ex yo suras in animals in clu dir g $Term studies (b) chr mic and acute aq oau resto section Ir - Sadie tion Ched s try It vi11 be the primary duty of t ? is section to seek, primarily by chcinical techniques, (1) meaos of Cet ect iv early due from re diet ion and radioactive mtericrls, (2) studies on the mechanism of rad k tio a effects. It is expected that much of this work viil be collaboration vl th section 3.