A generalized definition of dosimetric quantities

The current definitions of microdosimetric and dosimetric
quantities use the notion of 'ionizing radiation'. However, this
notion is not rigorously defined, and its definition would require
the somewhat arbitrary choice of specified energy cut-off values
for different types of particles. Instead of choosing fixed cut-off
values one can extend the system of definitions by admitting the
free selection of a category of types and energies of particles
that are taken to be part of the field. In this way one extends the
system of dosimetric quantities. Kerma and absorbed dose appear
then as special cases of a more general dosimetric quantity, and an
analogue to kerma can be obtained for charged particle fields; it
is termed cema. A modification that is suitable for electron fields
is termed reduced cema.