For citations:

Oborin A.V., Villevalde A.Y., Trofimchuk S.G. National primary standard of air kerma, air kerma rate, exposure, exposure rate and energy flux for X-rays and gamma radiation GET 8-2019. Izmeritel`naya Tekhnika. 2020;(8):8-12. (In Russ.) https://doi.org/10.32446/0368-1025it.2020-8-8-12