= 4, lees Shhlirrrsn the averey2 individusl during a large fractior formation cin be tolerated by of tis lifetime vithout any injurious effects. The mtst offective protecting from these penetrating radiations is frem the source, However, in cases where the distance becomes ter than the handling techniques sllow, then massive shielding and semote ecntrol of handlins cevices are usedo The other main reyuirement is that racioactive contamination must be cortrolled so that there is no unwanted migration of radioactiv&éty into pleces where it may harm persons (i.e. by accidental or unknowm ingestion, inhaletion, or irradiatioh} cr where it my harm experimental work or product: Since radicactiviuy is slweys ascecisted with matter, the prevenion Lope gat, a arceully af cisilsl we; (e feeslun of f rf. ~ ped 4 b 6) ct io to yy oO = y, t iy — ereslln difters trex the norual prob % of ctntestortion tceomes a pecblecn of catericl control, However, this control in thet the ws ewes Loe ee eee . tora r = rongs JS downward to o.1h frec’ions of » microenicrogm a million milidosath: of a rrem), 4 n ma TTA 27 t~ . . teat at : _ rou aed oe 2 gto’ % bud Qinbrel afPrP th vnese svpmicro.copie end invisiile quantities of we, dos 7 eolorted.s rowan ete moth te ve Lo ee pont begemea ciafices to the povuluus of beocteriolozy ype See combirsd,. co, tamin - mtn ve potpe vn tpn 2 Meat? a Uovevor, valike Jovectlors or pA? and toxicclogy 2 nan ~ = 3 22 ae polscsncas ceterials, recicactive “ism muct be contat ed do vtucs 2% camot be killed or meutralized.s f rages oe a” FF 3 soma ak ert : 2 . The votuction ef uny iv ciovobive contrinine Lion dapends upen the hslf-life of the metericl, its decay prolucts or ius comclete renoval. fms problem of disposal of redfusctive waste neteriels scems, at the outset, to the incividual working with relatively smel1 amounts of these problems, . miner fcoctor eomparcé te his immediats general research ar4 materi3is as a Nevertheless, when the sum totel of all the radioisotopes used in the entire country is considered, the émount becones large and the ine ‘iveriminete disposal cver the years may result in serious contamination ny ( :) of wat.ur shedse The disposal probelm kas been recognized for its