[Concept of effective equivalent dose for medical irradiation]

The applicability of the concept of an effective equivalent dose to medical irradiation was substantiated. Some specific problems for calculating this value were discussed. The problem of a correct choice of a group of "the rest of organs" was considered. Basing on the mean estimation of the mean tissue doses received by patients in different x-ray studies a maximum of 6 organs was proposed for this group: the liver, kidneys, adrenals, stomach, pancreas, and spleen. It was shown that the same organs could be used in the calculation of effective equivalent doses from other (nonmedical) ionizing radiation sources.