BS ISO 6980-2:2004

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Calibration and traceability of reference radiation
  fields
5 General principles for calibrations of radionuclide
  beta-particle fields
  5.1 General
  5.2 Scaling to derive equivalent thicknesses of various
      materials
  5.3 Characterization of the radiation field in terms of
      penetrability
6 Calibration procedures using the extrapolation chamber
  6.1 General
  6.2 Determination of the reference beta-particle
      absorbed-dose rate
7 Calibrations with other measurement devices
  7.1 Calibrations with thermoluminescence dosemeters
  7.2 Calibrations with thermally stimulated exo-electron
      emission dosemeters
  7.3 Calibrations with ionization chambers
  7.4 Calibrations with scintillator detectors
8 Measurements at non-perpendicular incidence
9 Uncertainties
Annex A (informative) List of symbols
Annex B (normative) Extrapolation chamber measurements
Annex C (normative) Extrapolation chamber measurement
        correction factors
Annex D (informative) Example of an uncertainty analysis
Bibliography

Provides methods for the measurement of the directional absorbed-dose rate in a tissue-equivalent slab phantom in the ISO 6980 reference beta-particle radiation fields.

This part of ISO6980 specifies methods for the measurement of the directional absorbed-dose rate in a tissue-equivalent slab phantom in the ISO6980 reference beta-particle radiation fields. The energy range of the beta-particle-emitting isotopes covered by these reference radiations is 0,066 to 3,54 MeV (maximum energy). Radiation energies outside this range are beyond the scope of this standard. While measurements in a reference geometry (depth of 0,07mm at perpendicular incidence in a tissue-equivalent slab phantom) with a reference class extrapolation chamber are dealt with in detail, the use of other measurement systems and measurements in other geometries are also described, although in less detail. The ambient dose equivalent, H*(10) as used for area monitoring of strongly penetrating radiation, is not an appropriate quantity for any beta radiation, even for that penetrating a 10mm thick layer of ICRU tissue (i.e. E_max>2 MeV). If adequate protection is provided at 0,07mm, only rarely will one be concerned with other depths, for example3mm.

This document is geared towards organizations wishing to establish reference-class dosimetry capabilities for beta particles, and serves as a guide to the performance of dosimetry with the reference class extrapolation chamber for beta-particle dosimetry in other fields. Guidance is also provided on the statement of measurement uncertainties.