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Radiation Protection Dosimetry 28:37-40 (1989)
© 1989 Oxford University Press

Variation of Calculated Organ Dose Equivalents and Some Operational Quantities with Q Values for Photons

M. Zankl, N. Petoussi, R. Veit and G. Drexler

Organ and tissue dose equivalents and operational quantities are related to the Q values. If energy-dependent Q values for photons are considered (as, for example, proposed by ICRU 40) the values of the above quantities will change; their variation should, therefore, be assessed. Theoretical calculations were performed using a Monte Carlo program which follows the transport of photons in different media, coupled to the GSF voxel phantoms. Dose equivalents were calculated for a large number of organs and tissues of a baby and a child, as well as the effective dose equivalent, HE, resulting from external photon irradiation in the energy range 10 keV to 1 MeV. Calculations using the ICRU sphere were also carried out to determine the ambient dose equivalent, H*(10) for various photon energies. All calculations were performed using Q = 1.0 and energy-dependent Q values, as proposed by ICRU 40. Some results for different organs of the phantoms and for the sphere and for different irradiation geometries are presented and discussed. It is shown that the alteration in the calculated organ and ambient dose equivalents reflects exactly the trend of the change of the Q values.


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