The rad is the correct unit used to report the measurement of

${}_{92}\mathrm{U}^{238}$ decays successively to form ${}_{92}\mathrm{U}^{234}$. What are the radiations emitted in these three steps

${}_{92}\mathrm{U}^{238}\stackrel{}{\to }{}_{90}\mathrm{U}^{234} \stackrel{}{\to }{}_{91}\mathrm{U}^{234} \stackrel{}{\to }{}_{92}\mathrm{U}^{234}$