When does the nucleus of an atom tend to become radioactive?
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The nucleus of an atom becomes radioactive when number of neutrons in the nucleus exceeds the number of protons in it.
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What are radio isotopes? Give one example of a radio isotope. State one use of radio isotopes.
Why are the alpha particles not used in radio therapy?
State the medical use of radioactivity.
Arrange the α, β, and γ radiation in ascending order of their biological damage. Give reason.