1 Scope
This document specifies methods for the measurement of the absorbed-dose rate in a
tissue-equivalent slab phantom in the ISO 6980 reference beta-particle radiation fields. The energy range of the beta-particle-emitting
isotopes covered by these reference radiations is 0,22 MeV to 3,6 MeV maximum beta energy corresponding to 0,07 MeV to 1,2 MeV mean beta energy. Radiation energies outside this range are beyond the scope of this document. While
measurements in a reference geometry (depth of 0,07 mm or 3 mm at perpendicular incidence
in a tissue‑equivalent slab phantom) with an extrapolation chamber used as primary standard are dealt with in detail,
the use of other measurement systems and measurements in other geometries are also
described, although in less detail. However, as noted in ICRU 56 [ 5 ] , the ambient dose equivalent, H *(10), used for area monitoring, and the personal dose equivalent, H p (10), as used for individual monitoring, of strongly penetrating radiation, are not
appropriate quantities for any beta radiation, even that which penetrates 10 mm of
tissue ( E max > 2 MeV).
This document is intended for those organizations wishing to establish primary dosimetry
capabilities for beta particles and serves as a guide to the performance of dosimetry
with an extrapolati...