The modern treatment method $P.E.T.$ is based on:

$A$ radioactive nucleus undergoes a series of decays according to the scheme
$A \xrightarrow{\alpha} A_1 \xrightarrow{\beta} A_2 \xrightarrow{\alpha} A_3 \xrightarrow{\gamma} A_4$
If the mass number and atomic number of $A$ are $180$ and $72$,respectively,then what are these numbers for $A_4$?

The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter nucleus is an

Which waves are used in the treatment of cancer?

The particles emitted in the decay of $ { }_{92}^{238} U $ to $ { }_{92}^{234} U $ are:

Curie is a unit of