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]
=