(a) Which radiation or particle from radioactivity produces maximum biological damage?
(b) State three precautions that must be taken while handling a radioactive source. [3 MARKS]

Part (a) : 1 Mark
Part(b) : 2 Marks

(a) $\gamma -radiations$ produce maximum biological damage among all other radioactive radiation.

(b) The main precautions are :
(i) Source should be kept in a thick - walled lead container, when not in use.
(ii) Person should wear special protective (lead coated) clothing while working with a radioactive source.
(iii) Radioactive source should be handled with a long pair of lead tongs.