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Radioactivity

Gamma Rays from Radioactive Decay.

When a radioactive nucleus emits an a-particle or a b-particle
the protons and neutrons in the new nucleus
may not be in their most stable form.
The protons and neutrons can rearrange themselves to become more stable
and in this process energy is emitted in the form of gamma rays.

Below are examples of both a and b emitters which give off g-rays.

Uranium Decay to Thorium

Strontium Decay to Yttrium

The nuclear equations are balanced.
The g-rays do not affect the mass or atomic numbers.

Pa (protactinium)-234 is an example of a radioactive nucleus
which only emits g-rays.

Protactinium Decay showing only Gamma Radiation

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