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GLOSSARY

Dose definition

Published by a LexisNexis Energy expert

What does Dose mean?

Measurement characterising the exposure of individuals subjected to radiation. The term ‘dose’ is often mistakenly used instead of ‘dose equivalent’. (a) absorbed dose: quantity of energy absorbed by matter (living or inert) exposed to radiation. It is expressed in Grays (Gy). (b) Dose equivalent: in living organisms, an absorbed dose has different effect depending on the type of radiation (alpha, beta and gamma). To take these differences into account, a dosemultiplying factor is used to produce a “dose equivalent”. (c) Effective dose: sum of weighted dose equivalents deposited on various tissues and organs by internal and external irradiation. The unit of measurement for effective dose is the Sievert (Sv). (d) Lethal dose: fatal dose of nuclear or chemical origin. (e) Maximum permissible dose: dose that must not be exceeded for a given period of time.

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