effective half-life


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ef·fec·tive half-life

the time required for the body burden of an administered quantity of radioactivity to decrease by half through a combination of radioactive decay and biologic elimination.

effective half-life (ehl)

the time required for a radioactive element in an animal body to be diminished by 50% as a result of radioactive decay and biological elimination. The effective half-life is equal to the product of the biological half-life (bhl) and the radioactive half-life (rhl) divided by the sum of the bhl and the rhl: ehl |m= (bhl × rhl)/(bhl + rhl). See also biological half-life.

ef·fec·tive half-life

(e-fektiv haflīf)
Time required for the body burden of an administered quantity of radioactivity to decrease by half through a combination of radioactive decay and biologic elimination.

effective half-life,

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