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Dutch version
Natuurkunde kernfysica v4.xls  
  Radioactivity          
    Decay constant         λ = (1 / τ ) ln 2
λ [s-1] =
τ [s] =
    Activity         A (t) = λ N (t)
A (t) [s-1] =
λ [s-1] =
N (t) [-] =
    Activity         A (t) = - ΔN (t) / Δt
A (t) [s-1] =
ΔN (t) [-] =
Δt [s] =

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