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Radiation Protection Dosimetry 28:131-134 (1989)
© 1989 Oxford University Press

Application of the New Dose Equivalent Operational Quantities in Low Energy X Ray Dosimetry

J. David and G. Drexler

Low energy X rays in the context of this paper are photons with energies less than 200 keV. These energies are found in many fields of radiation protection as shown by the results of a personal monitoring service. The number of people involved and the collective dose in this energy range make it worthwhile to think about these sources. Physically it is a field of complex interaction of photons with matter, especially because of the considerable influence of the shape and the composition of the interactor. That means that the presence of a phantom changes the radiation field substantially. Data basic to this are backscattering factors and ratios of the mass absorption coefficients. This surely reinforces the main argument for the new quantities, which should allow a conservative estimation of the effective and the organ dose equivalent. The interpretation of the area doses, H* and H', is now easier, but the interpretation of the individual doses, Hp, within the energy range mentioned above has become more difficult.


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