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: The '''radioactivity''' of a [[sample]] is measured in [[Becquerel]]s (Bq) which is the number of [[Radioactive Decay|radioactive decays]] in a [[sample]] per [[second]].
: The '''radioactivity''' of a [[sample]] depends upon the amount of [[Unstable Isotope|unstable isotopes]] in the [[sample]] and the [[Half Life|half life]] of the [[isotope]].
: '''Radioactivity''' is a [[scalar]] quantity as it has [[magnitude]] but does not have a direction.