Question

radioactive substances
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Answer 1

Explanation:

Radioactive substances are atoms that decay naturally. They can give off alpha particles, beta particles and gamma radiation. Unlike X-ray sources they cannot be turned off, so their control is more difficult.

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Answer 2

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✨ A radioactive substance is unstable and produces dangerous kinds of radiation.

✨ It is unstable because the strong nuclear force that holds the nucleus of the atom together is not balanced with the electric force that wants to push it apart.

✨ Because it's unstable, the atoms will decay into more stable ones.