Which metal is used in radiation shielding?

Tritium undergoes radioactive decay giving

If $_{92}U^{236}$ nucleus emits one $\alpha$-particle,the remaining nucleus will have

Consider the radioactive disintegration ${}_{82}A^{210}$ $\rightarrow B$ $\rightarrow C$ $\rightarrow {}_{82}D^{206}$. The sequence of emission can be

$_{72}^{180}X$ $\xrightarrow{2\alpha}$ $\xrightarrow{\beta}$ $\xrightarrow{\gamma} _{Z}^{A}X'$. The values of $Z$ and $A$ are:

Tritium,a radioactive isotope of hydrogen,emits which of the following particles?