Uraan-238: Verskil tussen weergawes
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[[Lêer:Uranium238.jpg|duimnael
'''Uraan-238''' (U-238) is die [[isotoop]] van [[uraan]] wat die meeste voorkom in die natuur. Dit is nie splytbaar nie, maar wel 'n [[fertiele materiaal]]: dit kan stadige [[neutron]]e opvang en na twee [[beta-ontbinding]]s kernsplytbare [[plutonium-239]] word.
== Natuurlike vervalketting ==
Uraan-238 verval soos volg na lood-206:
:<math chem>\begin{array}{l}{}\\
\ce{^{238}_{92}U->[\alpha][4.468 \times 10^9 \ \ce y] {^{234}_{90}Th} ->[\beta^-][24.1 \ \ce d] {^{234\!m}_{91}Pa}}
\begin{Bmatrix}
\ce{->[0.16\%][1.17 \ \ce{min}] {^{234}_{91}Pa} ->[\beta^-][6.7 \ \ce h]} \\
\ce{->[99.84\%\ \beta^-][1.17 \ \ce{min}]}
\end{Bmatrix}
\ce{^{234}_{92}U ->[\alpha][2.445 \times 10^5 \ \ce y] {^{230}_{90}Th} ->[\alpha][7.7 \times 10^4 \ \ce y] {^{226}_{88}Ra} ->[\alpha][1600 \ \ce y] {^{222}_{86}Rn}}
\\
\ce{^{222}_{86}Rn ->[\alpha][3.8235 \ \ce d] {^{218}_{84}Po} ->[\alpha][3.05 \ \ce{min}] {^{214}_{82}Pb} ->[\beta^-][26.8 \ \ce{min}] {^{214}_{83}Bi} ->[\beta^-][19.9 \ \ce{min}] {^{214}_{84}Po} ->[\alpha][164.3 \ \mu\ce{s}] {^{210}_{82}Pb} ->[\beta^-][22.26 \ \ce y] {^{210}_{83}Bi} ->[\beta^-][5,013 \ \ce d] {^{210}_{84}Po} ->[\alpha][138.38 \ \ce d] {^{206}_{82}Pb}}
\end{array}
</math>
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