@ice plan
[imath]\overline{M}_U=\frac{99,28.238+0,72.235}{100}=237,9874[/imath]
[imath]n_{U_3O_8}≈0,01188(mol)[/imath]
=>[imath]n_{U}≈0,03564(mol)[/imath]
=>[imath]n_{U_{238}}≈0,03538(mol)[/imath]; [imath]n_{U_{235}}≈2,6.10^{-4}(mol)[/imath]
k([imath]U_{238}[/imath])=[imath]\frac{ln2}{4,5.10^{9}.365.24.60.60}≈4,8833.10^{-18}[/imath]
N([imath]U_{238}[/imath])=[imath]0,03538.6,02.10^{23}[/imath]≈[imath]2,1299.10^{22}[/imath]
=>[imath]H_{U_{238}}[/imath]=k.N≈ [imath]1,04.10^{5}[/imath] Bq
k([imath]U_{235}[/imath])=[imath]\frac{ln2}{7,1.10^{8}.365.24.60.60}≈3,0957.10^{-17}[/imath]
N([imath]U_{235}[/imath])=[imath]2,6.10^{-4}.6,02.10^{23}[/imath]≈[imath]1,5652.10^{20}[/imath]
=>[imath]H_{U_{235}}[/imath]=k.N≈4845,39 Bq
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