Click here to load reader

Le Réacteur nucléaire naturel d’Oklo au Gabon : المفاعل النووي الطبيعي لأوكلو بالغابون

  • View
    277

  • Download
    3

Embed Size (px)

DESCRIPTION

التمرين + التصحيح

Text of Le Réacteur nucléaire naturel d’Oklo au Gabon : المفاعل النووي الطبيعي...

,..tli I : .l., ,...Lli _,..li ,et..li _..t.lt. Le Racteur nuclaire naturel dOklo au Gabon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eV mol g U M s an mol NA19 1 235 7 1 2310 . 6 , 1 1 ; . 235 ) ( ; 10 . 3 1 ; 10 . 6 = = = = ..=\ 1 2 3 4 5 6 7 8 9 ..,_'=_\\__,,.\ (Ln)0 0,7 1,1 1,4 1,6 1,8 1,9 2,1 2,2 1 .. _.\1.1 _=,,= ___. .='= _= _',= __,'=\', .=.=\ _ ..=, '= _',.= _= _>=, _.\ _=_=\ ..= 1.2 ..= '.\ U(238) \ ==, _' _>=, ___._. -,\'.\ -,__.\ .>='.\ _ (4) ... (3) .... u(2) e p ) 1 ( 2359223994239942399301 -23993239922399223892+ + + +U Pu P NpN U U n U .>='.\ .,\=. __., ___ (3) _ (4) _='==. ='=.\ -_. _\ _,== _.'.\_ .='.\ ..\ .='==\ 1.3 _,=. _' ._. .== -=,.. __== _,=. -.= .\_. . ___. .='. .=_ _.>' _' _' _,, U(238) .== 2 _'..\ _='==.12 ( . .,= __= - _='==. ='=.\ __.'\ ===, -=== N = N0 e-t .,= -,='==. -.,'.\ =,_. _.\ ->=\ .,.' =.\ _==, t1/2 22 ( .'=.= ._,.__>\ -,='==. -.,'.\ .=_ _,== ._, ..= _.\ .__\ .'=_\==\ _\= 235 ) _= _,=. t1/2-.=\', _..=\ _,,=.\ .= _ (an) ( 32 ( ._,.__. _'_ _'.. _' .,. 235 _= 3,5% _\ 0,72% ._,.__. __. ..=\ _'.. '.\,', 235 .='==, 8 .=\ ..= t '.,\=., _.\ _,_=.\ .',=== __. -=,..\ .= .= _'..\ .= 3 ( -'=\ -=_.==\ _= _= .='= _. __ _= _,, .>='. _'==.. .>==\ - .\ _ ..=. _ .='= ___. n 3 Sr Xe n U109438139541023592 + + + Xe _ __.,_>\ Sr .='.\ .= _= -=.'.\ -'=\ '=.,, ._,.__.= Q=120MeV13 ( _.'.\ -\.> _= _,=. . -,__.\ .',_,\ _ MeV/c2 __'=. -\.> .> 1 MeV/c2_'=. -'= '=_'>. _ 1 MeV -\.> _,=. ==' m-.=, .== .. ___.\ .='.\ .>= -=_===\\ 23 ( ___. .__> =\..=, ___. .='= _ m1 = 2350 kg _= U(235) .= .>= t1 = 3 ans .'=.=. _= 123 ( __.\ ..= ..= N1.=\ .= .>= _==.=\ 223 ( -=.'.\ -'=\ .== E . MeV ._=\', .. >='.\ .> _' .,. . -'=\ _. ',,_. -... Q 323 ( .='=\ ..\ -,__=\ -==_.=\ _.\ -...=