*“ . at she ne OEM ee N te been Ny : sao a SR nee RNa need ee Oe SE yt ineahemDebdEwit ecdic bees toa from radicnuctide darcitos in another homan pop:! tion is Incomreveriible Two leuke das fete eos ced i tas populauaon, bul i sS mot certain wether they are netor oc. Of spect’ ints eestin this sundy is the effect oF protracitsn of uxrosure renorte 4 : wa ver Ge very retven de agen Cer a teed otal desc, pretraction ot Uae caposure. This is contriury toihe Jsuat doserate etects seen wi radiobheogs Which postidle that More recovery can occur al wWer dose-rate:: and exceegs aver unkuscal expectation of fitde eect ot de se-rate wih high finger energy transfer (LUT) radiidon (39 46). Spiess & Mays offer several plausime padiubiGuccticds explanations cer this unusual, bur not unknown, eMen cf prowdecuen, ou, merntoed munibers of irradiated cells, iuss subsequent aig of promahes mnt css, y srovom aio oF Uae stimulus te ced division, eie. Lown reenains dilicult to esplain. A further eaamination of this phenomenon is ely in order. Uranium miners.--A third important kuman populauen demonstra ng ‘he carcineyenic effects of radionuclides is the group of miners “ho work Uncerground on uranium mines. High incidence of pulmonary carcinoma occurs in this group. From a sccio-economic standpoint, this is one of the most impertzat expose porulations extant, as individuals are currently working and exc. tre contral for thers is a lively and immediate topic. But it is also a much: cre didicul. group to amaluze because of technical and scientific cormate atic — pariicularly dosimetry—than either of the radium groups. The fact that miners in certain areas of Central Lurupe (Erz siountains, hed excessive d'scase of the respiratorysystem and that there was a high inc.cec cre Cr IUVL AnCeL , she boat be , rae Ges veen snow iiera voy tong we, Tha. ik was due in paribus facst ta saresure to radeon fand its daughter products) in the micves (sao mort mere recent reahzation (471, The most studied and anaivzed populatettre . Gg vty Bhoobb oat . : . bt ~ . . a: : n + miners of tre Colorado Plateau region in the United States. several recent yh es cheat, syinpes:. and government. ld reviews. including heartnus before tos Puce © mittee cv Atomic Energy of che Congruss. nrevide ampie 2ocumme thin (8 - :. ‘Tne subject ts stil controversial but (ae primary facis have now Deen reas7 well settled. The proerm here is not uranium at all, but exposure to radon gas seevirs into the tunne’s from the decay of radtum in the urantumore te radon. ant ID Luh, Geeseag tO iS otbele! waar proddeis, Kad cee, wo ante. : Rac 7!) Bac’ Cl*Po), ReaD ChoPb), RoE ChB. ono tak Oe. Voce ar ia, be present In Verwing Peaporacns SQuei te Guan ho eel Cos san die may develop in the bad frem cogenoers that tvere fearhir fos Grae ike: ot mie seve. dl uguser produces are ihe cgrvirab cies | p. at moet alatison or tars: our dausbter-charwss g eretoairei cs 27s . . 2 Pow UMS: o sper gta tease ete os AD: Poin a ye ai oo 2 yous. Ap lrecuble date ti ons coger becufs ‘QueTH emieers Bai tee artar cance ime Soy ieovara rtirasnectae devirmination of exposure. Since the bre nese ficst i peortaat of these acuzhers are a-emitting muclides, and all bat rane7 \ RSTOEa Ne “aga 5 F See he NTESty eterSSwe aad \\ aerate cme oyeetee: * og ws > . ! PSHE prtpspe erreur es UE pt ot recap fs Ce ey ns da REGEDhe eer AAR ga 5p ov “ } * we Pu ek wiley rep oe . x eh yt, ph gedeute ' “ BO Bree OE abi Bop “pe te OBebay thewrt ’ : | ee AE BY ore ay rn yoy y > a! , - eeee SG ee Re etPrtnt der na eat : ‘bas , Bats See pid bh ect