Glossary 1.1

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The glossary provides definitions and explanations of key terms and concepts essential to understand the topic in the lesson. Be sure to familiarize yourself with each term before attempting the lesson glossary quiz.

Browse the glossary using this index

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R

Radioactivity

the spontaneous decay or disintegration of the nucleus of an atom

Radioisotope

an isotope that emits radioactive gamma rays and/or subatomic particles (for example, alpha and/or beta particles)