The article deals with the development of the reference means of support and metrological insurance required for metrological verification and calibration of beta and gamma radiation dosimeters. The latter are extremely necessary for dosimetric measurements of radiation characteristics in the field of radiation safety, radiation diagnosis and therapy. In addition to traditional requirements and issues related to the design, development and use of these standards, there are considered a row of problems caused by radiation safety, during the metrological inspection and calibration of dosimeters, as well as while creating and operating the standards themselves. The purpose of this work is an analysis of the state of the metrological provision of measurements of gamma radiation characteristics in the area of dosimetric measurements and the search for ways to improve the reference base.
The issue of transmitting the size of the measurement unit with reference ionization chambers in the process of metrological checking/calibration of dosimeters at the UDD-Inter facility is also considered. It is shown that metrological verification/calibration is allowed for devices that have been compensated energetically. It is underlined that testing of standards and calibration devices for dosimetric control should meet two main requirements, namely the contribution of external scattered radiation to radiation from the source in the capsule must not exceed 5 % of the total power in the air; the power of the considered radiation in the air should be inversely proportional to the square of the distance from the center of the ionization source to the detector center within deviations ± 5 %.
 A. Abudra’A, Development of new dosimetric standards for low energy X-rays (≤ 50 keV) used in contact radiotherapy, 2017, [On-line]. Available: https://www. researchgate.net/publication/324217513_Development_ of_new_dosimetric_standards_for_low_energy_X-rays_50_keV_used_in_contact_radiotherapy
 ISO 4037-1:1996. X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy -- Part 1: Radiation characteristics and production methods. [On-line]. Available: https://www.iso.org/standard/20781.html
 ISO 1677:1977. Sealed radioactive sources – General. [On-line]. Available: https://www.iso.org/ standard/6291.html