Document qnaoe8dLLorVeR87bNKB8gXj

0 y Wft/nr.r & Skidmorv: Deposition and Retention in Rat* too 79 0 ivm o ;`vl w 1-IJ a4s * . DIAMETER U D IS MICRONS . ' Flfiimv- t. Site selection characteristic of horizontal elutriator. I.-..' r.a$ shown in; lions per bour,^ VdttftL to elutriator was used. The design size selective characteristic of the elutria-.. tor ii shown in FIGURE 2. The free-falling speed of a particle is dependent an it* alts, shape, and density and is conveniently expressed in terms of the sphere of unit density having the same falling speed. Particles with falling speeds greater than that,'of a 7.1 micron unit density sphere would fall Impenetrate the elutriator and to were excluded from the collected irt deposit'd.^ the vacant cage compartment and sampled continuously taringeeeh;i1ff^' -ftber. Per, jlftjijl ^ ppo'ure period, A few samples were altoobtainedto each inhalation cham^'' 1i66)**a 'Tw. wHlTa Long "Running TVi^l l^lplUtor. whlch lncorporates a /.y^-u `her'was sub-^v ' thlmnnilar elutriator. to determine the pnartkie length distributions. -7.','.*^sfws<.' ^ ^vlduai c*'g*.f^ '>*>'M 0 :'.ri ;# &****&*$ Btpotwri^md Survivtl ' '' The rats were exposed, .to the dust clouds for ,7Vh hours per day. on 6 jenUations'oif;^ ...4W of each week over period of.6 weeks. At the end of.each ds^'e ex> ust/ tnoludlng^ ijposuft the rata were transferred from th^iirtM^^ V^'v: ^jj rate throi l^.byvr. ^^rtUq.frota w ctKera. On*4tX *ftr (MiMt <Uy of.expo*utfifSbopaW^ I^W^^gtOUpii^'OM male' ihd^d temaje' ta''pdahd% t6ve^*4uA <!iooff^ _ 18 taw?. rxmiryr"'v*M '"** i $000 0975 PRODUCED BY FORD