The diagram shows three types of radiation, X, Y, and Z, being emitted from a radioactive source inside a lead box and passing through an electric field.
Answer the questions using words from the list:
alpha | beta | gamma | negative | neutral | positive | proton | neutron
a.[4]
(i) What is the name of the radiation labeled X?
(ii) What is the name of the radiation labeled Z?
(iii) What is the electrical charge of the radiation labeled Z?
(iv) What is the electrical charge of the radiation labeled Y?
b.[2]
Suggest two reasons why gamma radiation is used in medical imaging (such as a PET scan or tracer) instead of alpha radiation.