Question

A radioactive decay chain starts from $93Np^{237}$ and produces $90Th^{229}$ by successive emissions. The emitted particles can be.

• A. Two α-particles and one β-particle
• B. Three $\beta^{+}$ particles
• C. One α particle and two $\beta^{+}$ particles
• D. One α particle and two $\beta^{-}$ particles

Answer 1

Answer: (A)

Two α-particles and one β-particle

Answer 2

By using $n_{\alpha} = \frac{A - A^{'}}{4}$ and $n_{\beta} = 2n_{\alpha} - Z + Z'$