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An isotope of the original nucleus can be formed in a radioactive decay, with the emission of following particles.
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one $\alpha$ and two $\beta$
${ }_{\mathrm{Z}} \mathrm{X}^{\mathrm{A}} \stackrel{\alpha}{\longrightarrow}{ }_{\mathrm{Z}-2} \mathrm{Y}^{\mathrm{A}-4} \stackrel{2 \beta^{-}}{\longrightarrow}{ }_{\mathrm{Z}} \mathrm{X}^{\mathrm{A}-4}$
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