[Metrological support of clinical dosimetry]

The main requirement for the dosimetric support of radiation therapy for cancer disease is the necessity of keeping the high accuracy of dosimetric planning of radiation therapy. This dosimetric planning involves a number of components including the measurement of the supporting dose, the establishment of a correct orientation of a primary beam, the receipt of accurate data on the distribution of organs and tissues in the radiation area. In fact, in all the above components there are errors in the estimation of the basic values, which totally determine the total error in the dosimetric planning of radiation therapy. The paper analyzes the constituents of the errors and show their requirements to be met at the present stage of dosimetric works.