8ey - 30 - The work of. Laskin, et al, though not specifically involving deep respiratory tissue, does demonstrate a source . . 49 intensiiveresponse curve for lung tissue ~. A Ru-106 cylindrical source was implanted in the bronchi of rats, and cancers were observed to arise from the bronchial evsithelitun. (7 percent) | he response curve indicates a sudstantial ressonse even at 0.008 uCi burden, and a slow, anvroximately logaritnanic increase of tumor incidence over three orcers of masnitude rate, Tsmors w2rea (9.3 u diameter} with saveral microcuries toservec in 7? of 23 animals. In a second . oes Tasgxin, n ‘ O Cerber @xcerirent Cermser exnosed raz lungs +o Ca-iti sarticles. . 24/4 . th iy $e w ry wD 19° ves the incitence was acsroximately wro-inirds. 26 glass beats -accurulated Oo rr eccumula ws an 5 2css bh For =" ine Oo vrad. Oo L400 f esa owl LACrTeases WLIn w w cancer w2s ~ aa... yenarai.y on : - 2 lAncicaencea a] t(D beeen TaNMSr mh -" TAB For ve wegen: Loa . st tee a S., f M. Nusenner, ff “. Nelson, . 3. Altsnuliear, J.B. it = ~ “ae = = 22 Carcine7s of ina Lunzy in rats amnosad =: , . . As 5 l i OF intra-broncnia rerinanium--? selilsacs. on i ~ ft 7 -.?% ” ~k . vrtlitionszicts," J. Rol. Tanter Inst. IL, TT tee ~-= = a > 3 )asimerir From 2 Rucvrtectated me eye 244 >, LEES, op. 9259-532 eee . - twlatiniwwn pee nt,