The value of personal dose equivalent at10 mm depth is to characterize the
energy deposition of strong penetrating radiation in human body and is
derived by measurement of air kerma and application of conversion
coefficients from ISO report. However, the conversion coefficients depend
strongly on the photon energy and angles of incidence for low-energy
photons. In order to overcome the problem that the conversion coefficient of
low energy rays changes greatly due to the small change of energy, a
secondary standard ionization chamber was used to measure personal dose
equivalent directly. A matched reference field was established with (20-250)
kV X-rays and correction factors with Hp(10) chamber were calculated under
these radiation qualities with different angles of incidence. The results
showed that the differences were almost 22.7 % of correction factors for the
low energy photons at angles of incidence 0?. With conversion coefficient
recommended in ISO 4037-3-2019, performance of the chamber response with
respect to Hp(10) in the energy range from 33 keV to 208 keV was within
about ?10%, and in the energy range from 12 keV to 208 keV and for angles of
incidence between 0? and 75? was within about ?19%.
Calibration and measurement of X-ray personal dose equivalent with a Hp(10) ionization chamber
