The ratio of the appropriate value of the biological
effectiveness of the radiation in question to that of
X-radiation with an average
specific ionization
of 100 ion pairs per micron of water, for the particular biological effect under consideration
and for the condition under which the
radiation is received.
Source:
PAC, 1982, 54, 1533
(Glossary of terms used in nuclear analytical chemistry (Provisional))
on page 1551