Search Glossary Term:

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

H

Half-life (Biological)
The time required for an organ, tissue or the whole body to eliminate (excrete) one-half of an administered quantity of any substance by regular process of elimination. A biological half-life is approximately the same for both the stable and radioactive isotopes of any particular element.

Half-life (Effective)
Time required for an internally deposited radioactive element in a body to be diminished 50 percent as a result of the combined action of radioactive decay and biological elimination;

Half-life (Radioactive)
The time required for a radioactive substance to lose one-half of its activity by natural decay. Each radionuclide has a unique half-life.

Hematological
Of or relating to blood.

Return to alphabet