Abstract
The use of X ray facilities for precise irradiations requires exact knowledge of the radiation field. The effect of different ambient conditions on the radiation field is investigated. To correct the effect which different air densities exert on the characteristic spectrum properties of the radiation, such as the conventional true value of the air kerma, conversion coefficients from air kerma to personal (or ambient) dose equivalent, the mean energy or the half-value layer, calculations were performed for a large number of different spectrum properties for all radiation qualities defined in the ISO 4037-1 standard and in the German standard DIN 6818-1 at a high voltage of up to 120 kV. The calculations were checked by comparing some of the data with experimental results.
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