# Answer on Atomic and Nuclear Physics Question for Theo

Question #2655

What is the effective half life of Tc-99m.? & If the biological half life of Tc-99m is 10h and the physical half life is 6 h.

Expert's answer

We can calculate the effective half-life using formula

1/t

Hence te=10*6/(10+6)=3.75 h

1/t

_{e}= 1/t_{b}+ 1/t_{ph}Hence te=10*6/(10+6)=3.75 h

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