Answer to Question #2655 in Atomic and Nuclear Physics for Theo
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.
We can calculate the effective half-life using formula
1/te = 1/tb + 1/tph
Hence te=10*6/(10+6)=3.75 h