Effective Half-life 2
Effective Half-life 2 :
Radiation and Radiological Disasters. (1) The time required for the amount of a radionuclide in a biological system to be reduced to half its original value. The T½ effect is related to the biological half-life (T½b) and the physical half-life (T½) by: T½ eff. = (T½b x T½)/(T½b + T½). The clearance curve in a biological system may well be complex and not a simple exponential function. In this case the simple relationship given above is not valid (Wagner, 1968). (2) The time required for the amount of a particular radionuclide in a system to be reduced to half its value as a consequence of both radioactive decay and other processes such as biological elimination and burnup when the rate of removal is approximately exponential (ISO, 1972)
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