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Use of radioactivity- 
1) Many diseases such as cancer , leukemia are  treated with radio therapy. for e- Gamma radiations obtained from cobalt-60 is used for treating cancer.
on harmful effect - 
1) It result in short term recoverable effects such as dirrahea and can have genetic effects.

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Disadvantages of radioactive

If this happens in our body, the cells may die or they may undergo a change called a mutation. The result is called radiation sickness. A large dose of radiation will cause death!
advantage of radioactive
Killing Microbes:

Gamma rays successfully kill microbes that cause food to decay. So food treated with this radiation have a longer shelf life. Surgical instruments and syringes are also treated with gamma rays, in order, to prevent infections been transferred from patient to patient.
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