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Properties of Alpha, Beta and Gamma Radiations

Thorium 90T...

Question

Thorium $_{90} T h^{232}$ is converted into $_{89} P b^{208}$ by radioactive transformation. How many $α$ and $β$ particles are emitted?

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Solution

Number of alpha particles emitted $α = \frac{232 - 208}{4} = 6$
Number of beta particles $β = 89 - (90 - 6 \times 2) = 11$

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