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National primary standard of air kerma, air kerma rate, exposure, exposure rate and energy flux for X-rays and gamma radiation GET 8-2019
https://doi.org/10.32446/0368-1025it.2020-8-8-12
Abstract
The results of development of the national primary standard of air kerma, air kerma rate, exposure, exposure rate and energy flux for X-rays and gamma radiation GET 8-2011 in 2019 are presented according to the recommendations of the ICRU Report No. 90 “Key Data for Ionizing-Radiation Dosimetry: Measurement Standards and Applications”. The following changes are made to the equations for the units determination with the standard: in the field of X-rays, new correction coefficients of the free-air ionization chambers are introduced and the relative standard uncertainty of the average energy to create an ion pair in air is changed; in the field of gamma radiation, the product of the average energy to create an ion pair in air and the electron stopping-power graphite to air ratio for the cavity ionization chambers is changed. More accurate values of the units reproduced by GET 8-2019 are obtained and new metrological characteristics of the standard are stated.
About the Authors
A. V. Oborin
D. I. Mendeleyev Institute for Metrology (VNIIM
Russian Federation
Russian Federation
Alexandr V. Oborin
St. Petersburg
A. Y. Villevalde
D. I. Mendeleyev Institute for Metrology (VNIIM
Russian Federation
Russian Federation
Anna Y. Villevalde
St. Petersburg
S. G. Trofimchuk
D. I. Mendeleyev Institute for Metrology (VNIIM
Russian Federation
Russian Federation
Sergey G. Trofimchuk
St. Petersburg
References
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Review
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
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