A system of secondary standards for photon dosimetry

Abstract

More and more applications of ionizing radiations in research, engineering, medicine, and geology require dosimetric accuracy approaching the accuracy of standards. To meet these demands a system was developed of metrological support of dosimetric measurements of photon radiation based on the national primary standard of the exposure dose unit, the exposure dose rate, and the photon radiation energy flux - the Comecon standard [i, 2], and an extensive system of secondary working standards - the VET [3-7]. Most numerous dosimetric measurements include measurements of the exposure dose (ED), the exposure dose rate (EDR), the kerm (Ka), the kerm rate in air (KaR), and the air absorbed dose rate (ADR a) of x-ray and gamma radiation. As a result of the program of metrological support for the national economy implemented with the aid of the D. I. Mendeleev Institute of Metrology, territorial agencies of the Gosstandart and departmental metrological services have access to a system of secondary standards of exposure dose rate units of both x-ray and gamma radiation or of gamma radiation only.