Radioactivity and half life

Question 1

suggest why isotopes with short half life are used in medicine

Answer 1

does not stay in the patients system for long

Question 2

State why gamma radiation does not have an atomic or a mass number

Answer 2

Gamma radiation is not a particle so has no mass

Question 3

State what is meant by the term half life

Answer 3

The time for half of the nuclei of a particular isotope to decay