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  *The '''decay constant''' is denoted by the symbol '''𝜆'''.*The [[Decay (Physics)|'''decay]] constant ''' provides a [[measure]] of the rate at which a [[radioactive]] substance undergoes [[Decay (Physics)|decay]].*Higher [[Decay (Physics)|'''decay]] constant ''' indicates a more rapid [[Decay (Physics)|decay]] process.Used *The '''decay constant''' is used in the calculation of the [[activity ]] of a [[radioactive]] sample.