Uraniumreeks

De uraniumreeks of uraanreeks is een vervalreeks, waarbij het radioactieve isotoop uranium-238 in veertien vervalreacties vervalt tot het stabiele isotoop lood-206.

Het verval verloopt via thorium-234 (Th) en protactinium-234 (Pa) naar uranium-234 (U), vervolgens via thorium-230, radium-226 (Ra) en radon-222 (Rn) naar polonium-218 (Po), via lood-214 (Pb) en bismut-214 (Bi) naar polonium-214 en dan via lood-210 en bismut-210 naar polonium-210, welke als laatste vervalt tot lood-206.

De reacties zijn als volgt:

1. ${\phantom{A}}_{\phantom{92}}^{\phantom{238}}{\phantom{A}}_{\phantom{2}92}^{\phantom{2}238}\mathrm{U}⟶{\phantom{A}}_{\phantom{90}}^{\phantom{234}}{\phantom{A}}_{\phantom{2}90}^{\phantom{2}234}\mathrm{T}\mathrm{h}+{\phantom{A}}_{\phantom{2}}^{\phantom{4}}{\phantom{A}}_{\phantom{2}2}^{\phantom{2}4}\mathrm{H}\mathrm{e}$
2. ${\phantom{A}}_{\phantom{90}}^{\phantom{234}}{\phantom{A}}_{\phantom{2}90}^{\phantom{2}234}\mathrm{T}\mathrm{h}⟶{\phantom{A}}_{\phantom{91}}^{\phantom{234}}{\phantom{A}}_{\phantom{2}91}^{\phantom{2}234}\mathrm{P}\mathrm{a}+{\phantom{A}}_{\phantom{0}}^{\phantom{0}}{\phantom{A}}_{\phantom{2}0}^{\phantom{2}0}\mathrm{e}{\phantom{A}}^{-}$
3. ${\phantom{A}}_{\phantom{91}}^{\phantom{234}}{\phantom{A}}_{\phantom{2}91}^{\phantom{2}234}\mathrm{P}\mathrm{a}⟶{\phantom{A}}_{\phantom{92}}^{\phantom{234}}{\phantom{A}}_{\phantom{2}92}^{\phantom{2}234}\mathrm{U}+{\phantom{A}}_{\phantom{0}}^{\phantom{0}}{\phantom{A}}_{\phantom{2}0}^{\phantom{2}0}\mathrm{e}{\phantom{A}}^{-}$
4. ${\phantom{A}}_{\phantom{92}}^{\phantom{234}}{\phantom{A}}_{\phantom{2}92}^{\phantom{2}234}\mathrm{U}⟶{\phantom{A}}_{\phantom{90}}^{\phantom{230}}{\phantom{A}}_{\phantom{2}90}^{\phantom{2}230}\mathrm{T}\mathrm{h}+{\phantom{A}}_{\phantom{2}}^{\phantom{4}}{\phantom{A}}_{\phantom{2}2}^{\phantom{2}4}\mathrm{H}\mathrm{e}$
5. ${\phantom{A}}_{\phantom{90}}^{\phantom{230}}{\phantom{A}}_{\phantom{2}90}^{\phantom{2}230}\mathrm{T}\mathrm{h}⟶{\phantom{A}}_{\phantom{88}}^{\phantom{226}}{\phantom{A}}_{\phantom{2}88}^{\phantom{2}226}\mathrm{R}\mathrm{a}+{\phantom{A}}_{\phantom{2}}^{\phantom{4}}{\phantom{A}}_{\phantom{2}2}^{\phantom{2}4}\mathrm{H}\mathrm{e}$
6. ${\phantom{A}}_{\phantom{88}}^{\phantom{226}}{\phantom{A}}_{\phantom{2}88}^{\phantom{2}226}\mathrm{R}\mathrm{a}⟶{\phantom{A}}_{\phantom{86}}^{\phantom{222}}{\phantom{A}}_{\phantom{2}86}^{\phantom{2}222}\mathrm{R}\mathrm{n}+{\phantom{A}}_{\phantom{2}}^{\phantom{4}}{\phantom{A}}_{\phantom{2}2}^{\phantom{2}4}\mathrm{H}\mathrm{e}$
7. ${\phantom{A}}_{\phantom{86}}^{\phantom{222}}{\phantom{A}}_{\phantom{2}86}^{\phantom{2}222}\mathrm{R}\mathrm{n}⟶{\phantom{A}}_{\phantom{84}}^{\phantom{218}}{\phantom{A}}_{\phantom{2}84}^{\phantom{2}218}\mathrm{P}\mathrm{o}+{\phantom{A}}_{\phantom{2}}^{\phantom{4}}{\phantom{A}}_{\phantom{2}2}^{\phantom{2}4}\mathrm{H}\mathrm{e}$
8. ${\phantom{A}}_{\phantom{84}}^{\phantom{218}}{\phantom{A}}_{\phantom{2}84}^{\phantom{2}218}\mathrm{P}\mathrm{o}⟶{\phantom{A}}_{\phantom{82}}^{\phantom{214}}{\phantom{A}}_{\phantom{2}82}^{\phantom{2}214}\mathrm{P}\mathrm{b}+{\phantom{A}}_{\phantom{2}}^{\phantom{4}}{\phantom{A}}_{\phantom{2}2}^{\phantom{2}4}\mathrm{H}\mathrm{e}$
9. ${\phantom{A}}_{\phantom{82}}^{\phantom{214}}{\phantom{A}}_{\phantom{2}82}^{\phantom{2}214}\mathrm{P}\mathrm{b}⟶{\phantom{A}}_{\phantom{83}}^{\phantom{214}}{\phantom{A}}_{\phantom{2}83}^{\phantom{2}214}\mathrm{B}\mathrm{i}+{\phantom{A}}_{\phantom{0}}^{\phantom{0}}{\phantom{A}}_{\phantom{2}0}^{\phantom{2}0}\mathrm{e}{\phantom{A}}^{-}$
10. ${\phantom{A}}_{\phantom{83}}^{\phantom{214}}{\phantom{A}}_{\phantom{2}83}^{\phantom{2}214}\mathrm{B}\mathrm{i}⟶{\phantom{A}}_{\phantom{84}}^{\phantom{214}}{\phantom{A}}_{\phantom{2}84}^{\phantom{2}214}\mathrm{P}\mathrm{o}+{\phantom{A}}_{\phantom{0}}^{\phantom{0}}{\phantom{A}}_{\phantom{2}0}^{\phantom{2}0}\mathrm{e}{\phantom{A}}^{-}$
11. ${\phantom{A}}_{\phantom{84}}^{\phantom{214}}{\phantom{A}}_{\phantom{2}84}^{\phantom{2}214}\mathrm{P}\mathrm{o}⟶{\phantom{A}}_{\phantom{82}}^{\phantom{210}}{\phantom{A}}_{\phantom{2}82}^{\phantom{2}210}\mathrm{P}\mathrm{b}+{\phantom{A}}_{\phantom{2}}^{\phantom{4}}{\phantom{A}}_{\phantom{2}2}^{\phantom{2}4}\mathrm{H}\mathrm{e}$
12. ${\phantom{A}}_{\phantom{82}}^{\phantom{210}}{\phantom{A}}_{\phantom{2}82}^{\phantom{2}210}\mathrm{P}\mathrm{b}⟶{\phantom{A}}_{\phantom{83}}^{\phantom{210}}{\phantom{A}}_{\phantom{2}83}^{\phantom{2}210}\mathrm{B}\mathrm{i}+{\phantom{A}}_{\phantom{0}}^{\phantom{0}}{\phantom{A}}_{\phantom{2}0}^{\phantom{2}0}\mathrm{e}{\phantom{A}}^{-}$
13. ${\phantom{A}}_{\phantom{83}}^{\phantom{210}}{\phantom{A}}_{\phantom{2}83}^{\phantom{2}210}\mathrm{B}\mathrm{i}⟶{\phantom{A}}_{\phantom{84}}^{\phantom{210}}{\phantom{A}}_{\phantom{2}84}^{\phantom{2}210}\mathrm{P}\mathrm{o}+{\phantom{A}}_{\phantom{0}}^{\phantom{0}}{\phantom{A}}_{\phantom{2}0}^{\phantom{2}0}\mathrm{e}{\phantom{A}}^{-}$
14. ${\phantom{A}}_{\phantom{84}}^{\phantom{210}}{\phantom{A}}_{\phantom{2}84}^{\phantom{2}210}\mathrm{P}\mathrm{o}⟶{\phantom{A}}_{\phantom{82}}^{\phantom{206}}{\phantom{A}}_{\phantom{2}82}^{\phantom{2}206}\mathrm{P}\mathrm{b}+{\phantom{A}}_{\phantom{2}}^{\phantom{4}}{\phantom{A}}_{\phantom{2}2}^{\phantom{2}4}\mathrm{H}\mathrm{e}$

Zie ook

• Thoriumreeks