htwXd .ti.n Mcnre2k .-,

f, ,rkusk2k,ntrOd:,ISAtjos9.utn.,
1?..ADI[Or[SOPIiOPNS' IIJN ,,fAIPAN
e'.muaHmt""p's-ydet["-amw"mode.wtsJin SsT-hruaU,tu1igx' l
Radt.oisetope"S WeX-C-) 'bU't t;C) uffe Z'or tlte iEi]rfs't t.i.me fi.n J'e.pan, aboue X937 when
,\a,.24e P.-3c2. axad Ir-"ll->' wex'ch in,tiroduced i.n,to cherfl:l.ca:. a/ d bioXogricai xeeulcreareb.,
:ise,?2,W2f,g,l,,Y,W.g•?d',X..g' zz.9..[YE./2g'fiinEO,.,'TiX',ig,"t2g/.L'l?,2y.,s'lctuk,g\d,,Ch.egg'.gag•,Ree6'.,,
VIaxr ffe
Atomie mevcienete in J'apti-iML wasc) bazirined ffonc' some 'ti.rne ,tiÅíte.pt, the wain, buÅé thyx
lgsO the Amerethcan l'hdi.:Lodi' oph,i.caZ SocLte'iry px'eso.,nteed ehe M,aÅéo Dr. X"c).",hi,o
Nlshim,a wi'eh a ffsmaXM. amounic of radioio."oeopes, Wrj.ich, thrks, ars aficgttrtt;e
radioLsoeopes weii'ci t;hen :Lrri]}oxit;ed i'irrt,o tJ'a.lpaxxe rriosui'e off wlr.zLch we:re uutcred,
purely ffoxe x'eLev)ea:rcll, puuepoEI,os. riZn fi.abecai ll.C)EOs nz Vo'ic,En". o6 2700 mc wawcr
imported, :inÅë"iudskn,g r?1-l-9 rnc off llr.-raL5ll., a.xxdi "ev)ornG C-taLt•, S-th5.F? a:nd, Cas-tV', Wfi"t].,
widened app.1.icat.lori an.ct the a.rinc]".ec"mse o,f. a"v'extXab].e ,zaucXide,eq tihgi Xmpoxi;
of radio.1,so't;Qpes, s'h&xepLy :L.rxcnc'p.a:ev)eCl, llcr)o 'ir2aic by IL(PS'>8 'the xral,ue ue'eaÅëheel abozat;
128 mi:.tuj.on ye.n ($[>'c:'OsOOO..O....O.) tiioz' S'50 d,tLf.",C'encezÅë ir].ucll..i.dems, U'hexdv, >rea,sc may
be c&X'ied. 'tlrxe y'easc oÅí lvlr,Lo coming off age o.{".X :ncadfi.oG.cev)oixope crappirkcaic1.oza isu
Japan,
Since X957 iche itr&ng.e- o.f, apJpkicaicfuon, hafo' noic rkne,re,llsed ffo ,much akcr)" .in inhe
year$ l.rnmedrkatel"y befo2rE), but tYie amou.xzt; off jrtzad,rkoLsotcopems, Mxidi lr,lrme :xumbex'
oÅí es'ta'bll.:1.[pt)hmo..ifrk.s 'utt.)rt,:a,g tIn.em h..ave ?')een .Åëseeacin:ty E.ncz"easing by moxee ithexri
200/, a yeaur. rlhe Ja,I)ari Abomi.c X•l,nexgy Comrnsk,cr"rsioxL bei:xg dioxe so.me "Sme rnai.nxxy
conÅëex'nGd with iche diexvel.olpme.ne of nuc:Loa7 x)owe:r, keft nectnd,iothsoicope.Kcrb ico '
devel.op wj.'t;houxt loL:y'ow'j,ctrkng an,y s]peortiitffic ri.xice)ati.ve mea$u,ire6. 1]h..e Arc,C l,].axrj.xx,g
place6t emph.affsLF: rncati,.Mtl'1,y or}. .z'`ef,va, ]..a.'wtcncL ;r:.il'lr,hex' t;[ a,n, .IF):romo"efi.oxi o:ff "t;]rie (ilevel.ox)ew
mene fo.if :,r•ltd,:l.oi..cp"o"oopo"ms, i/"o,x', Åígorfie yea:rff)' iche ;1.xxctrrexasee j.n neadioi.gpt:otope 'u"tskXrk-e
zaicthon i.n "eh..i,g 'pe:].r.:'i.od. c)an, be)G. r.reg'ew?d.ed as.s s.tthCissÅíacto,y:y.
Phe px'odiuction aumd d:LEs:it'ihrrijL'Loxx c'f? p, trro•ce,ltnvs,c.ge•d rE'idi,oiHs)oto'pes oS' `7 :xucll.thdes.`
Was corltmexLÅëed thn Ii.962L' a..'t "Ir•].),e t3'ax)a-:,t A'icoriifi-c 1],,nex'gy' Elesea:rc'tr,i, Z.lrns.,'t.fi.tf;iitrtets.
(JAEiti[), `thu,cr, mak,fi r.Lg po,e:)'th'zt"r.)]Ne t]'.tto [i'u'p'.p:LLy' oS' th'hor't 11Life x•adjwoisotopec") no-tr
eatgy ico obtearl.n /Er.om abroE;).(3Lge 13y' 'the, oper7air:1.on oÅí 'the Åíi.Åést j'apFan madie
areaC'1iottre CYI?]),->7, wfi.'th:tr-ra 3S oy.' i-l- yec"L.trrbs JAJilR:EI e>