Physics
Physics
Physics
SHOW LESS
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
PHYSICAL HALF LIFE (t 1/2 OR T p )Time required to reduce activity to one halfIndependent of physical chemical conditionsDecay Constant, λ = 0.693/ t 1/2In one t 1/2 A o is reduced to 1/2 A o = A o / 2 1In n t 1/2 A o is reduced to A o / 2 nA t = A o / 2 n = A o / 2 ( t/t 1/2)= A o (0.5) (t/t 1/2)10 t 1/2 reduce A o to 0.1%MEAN LIFE (τ)Average life time of a group of radionuclidesτ = 1 / λ τ = t 1/2 / 0.693 = 1.44 t 1/2
Change language