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${ }^{234}$ U has 92 protons and 234 nucleons total in its nucleus. It decays by emitting an alpha particle. After the decay it becomes
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${ }^{230} \mathrm{Th}$
The $\alpha$ - decay in the case of ${ }^{234} \mathrm{U}$ takes place as follows :
${ }_{92}^{234} \mathrm{U} \longrightarrow{ }_{90}^{230} \mathrm{Th}+{ }_{2}^{4} \mathrm{He}$
${ }_{92}^{234} \mathrm{U} \longrightarrow{ }_{90}^{230} \mathrm{Th}+{ }_{2}^{4} \mathrm{He}$
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