Several correction factors for primary beta dosimetry in radiation protection have been determined by means of measurements and
simulations for both the well-known Böhm primary standard extrapolation chamber developed at PTB (which has been commercially
available for a long) and a new primary standard extrapolation chamber also developed at PTB. The correction factors kel for
electrostatic attraction of the entrance window due to the collecting voltage and ksat for ionization collection losses due to ionic
recombination have been measured. The following correction factors have been determined by simulations for normal (0°) as
well as oblique (15°, 30°, 45° and 60°) radiation incidence: kba for backscatter from the collecting electrode, kpe for
perturbaton by the chamber's side walls, and kra, kac and kdi for inhomogeneity inside the collecting volume. The latter three have
been combined to kih. Six more correction factors adoped from the literature are described to complete the necessary corrections.
A comparison with values given in ISO 6980-2:2004 (for 0°), all determined at that time by means of measurements, is shown
as well as the application of the new factors to measured data. The newly determined correction factors are ready to be
implemented in an updated version of ISO 6980-2.
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CC BY 3.0 ; Creative Commons Attribution 3.0 License
Themenbereich der Metrologie
Ionisierende Strahlung
Zitierung
Behrens, R. (2020). Correction factors for primary beta dosimetry. Metrologia, 57(6), 1–27. https://doi.org/10.1088/1681-7575/ab6cd6
