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The Answer

The human serum, albumin can be labelled with atoms of the radioactive isotope iodine 131. This has a physical half life of 8 days and a biological half-life of 21 days. Find the effective half-life.

1/TE = 1/TP + 1/TB

1/TE = 1/8 + 1/21

TE = 6 days (1significant figure answer required)