For
X- or
gamma-radiation in air: the sum of the electrical charges of
all the
ions of one sign produced when all
electrons liberated by
photons in a suitably small element of volume of air completely
stopped, divided by the mass of the air in the volume element.
Source:
PAC, 1982, 54, 1533
(Glossary of terms used in nuclear analytical chemistry (Provisional))
on page 1541
This definition replaces an earlier definition of exposure.