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324 q:dE^1| 6H=J € _ E a ol ,J.alal EE 7l7l 9lg 4 +9 Aol o3alal xf9 A6It tsE = c _ tr +ElrI E a ol *6}ql^l I F E+uI= dcldxol+. E +q tEg F6lq ol+6}= EAE EEg r4I +trI. r= +el tr4 "J F+61= EA el A * E= 9zI9 f4-zs. ^J 4e + 914. lel E r= *E+tsIql Eldl +4. 4 4*4 ?.1 -E^lg + 914. l]-ll z-l -uu (A ++) I re ++r ooooo----- ooooo" _ ' ,_._ _,_' ooooo _____ ooooo---: _ ooooo _____ ooaoo: __ : _ OOOOOl r-.-..-r-.- OOOOOl'-r-.-,-'- i}^L E au, ooooc COC'O COOCC oooco OCOOC COOOC .OOCO ccooo OCOCC COCOO OC'OC ooooc COCOO ooooo OOOCC OCC'O 1 ul lo ol r< 6Pl 0.5 0 1 0.5 0 0 x* (a) *4] del r}'rl 0 x* (b) +{ +el +'{ J=-D dc dx D= df ol-z qt4lf (airusion coefficient)EI +gq [cnfrlsec], llcrfi,/daylFE t+l -tr +4{+. ol 4ol Fick9 rI1B4ol4. ol ^lql^] qt4l+E *q tazl E= z) ? ac/axzl +oJ ,ll *49 x9 -u}aj9-E qt6l7l qEol4. oJ ^lql^l= +EE .tl 7J4 H+= tEJ 6lz1 9*L iltrI. qt€^Jg q+ drrl4 o-tr. a+6IElE tEq ^lz}4 HEI= l7lalo} +tr}. olql "il= 5E c= rlt ts+ tla x9 Elfell C4+q 9tol 9"1*l 9lg "fl "l ' .JrE *EE ^lz}4 BE+= +g ^l oE +qd4. aC -n "C at -u oxZ olag Fick9 xilzB4olzl-z +=4. 3. A, B4= ++el B+ql El]+ 4tol4 f++rllql^lE "l= 5e+ 9xL el= Ets EJ^ICqa(Ni6r)g !-F qael stscl ts?t4l 6|zI. ^laE EE"l ulel:4 r gE9 Elfgr] i4zl 59lgA(tracer isotopes)t: 'Jd+ qA +9tr d4l4 e-tr- +asl r+a"J zlzl$4!o1 ^ltql q4.l6J€4. rltol +E6l a++ +ql= +esl (homosenization)7| +trq =Ell ol zl aJ d4'd 'l f,++ EA LI "il ^l "J q += 9zlE el olF€ts_Elq zlzl4t(setf diffusion)ol+ +4. 14]. + Tllo]^JE CE9E ol +qd Er+q]"il^l flzlE ^JEaE olEg ^JEqt(inter diffusion)ol+ oJ4. 4. AeB ull+E qt6}= A+e+ eABalql 4+^'l +t}6l= e+el= qt9 +