Generate QR code
Open Access
Subscription Access
National primary special standard of absorbed dose and adsorbed dose rate to tissue-equivalent material for X-rays with limiting photon energy from 10 to 60 keV GET 73-2022
https://doi.org/10.32446/0368-1025it.2022-7-8-12
Abstract
Structure and physical principles of operation of the national primary special standard GET 73-2022 designed to reproduce and transfer units of absorbed dose and absorbed dose rate to tissue-equivalent material (water) for X-rays with limiting photon energy from 10 to 60 keV are given; its metrological characteristics are presented. Improved functionality of GET 73-2022 that meets current needs of radiation therapy using low-energy X-rays, including brachytherapy, is described. Absorbed dose and absorbed dose rate to tissue-equivalent material (water) in the standard are measured using ionization method by new primary measuring instruments – standard extrapolation ionization chambers: EK-R for measurements in low-energy X-ray fields of generating sources (X-ray tubes) and EK-I for measurements with brachytherapy radionuclide sources. Dosimetric measurements performed with the primary standard GET 73-2022 meet modern requirements for accuracy and range of units’ reproduction and transfer.
About the Authors
A. Y. Villevalde
D. I. Mendeleyev Institute for Metrology (VNIIM)
Russian Federation
Russian Federation
Anna Y. Villevalde
St. Petersburg
A. V. Oborin
D. I. Mendeleyev Institute for Metrology (VNIIM)
Russian Federation
Russian Federation
Alexandr V. Oborin
St. Petersburg
References
1. International Atomic Energy Agency, Absorbed Dose Determination in External Beam Radiotherapy, Technical Reports Series, 2000, no. 398, IAEA, Vienna.
2. Caswell R. et al., ICRU Report 72, Dosimetry of beta rays and low-energy photons for brachytherapy with sealed sources, Journal of the ICRU, 2004, vol. 4, no. 2, pp. 5–8. https://doi.org/10.1093/jicru_ndh020
3. Schneider T., Phys. Med. Biol., 2011, vol. 56, pp. 3387– 3402. http://doi.org/10.1088/0031-9155/56/11/013
4. Schneider T., Metrologia, 2012, vol. 49, pp. S198–S202. http://doi.org/10.1088/0026-1394/49/5/S198
5. Toni M. P. et al., Metrologia, 2012, vol. 49, pp. S193–S197. http://doi.org/10.1088/0026-1394/49/5/S193
6. Kawrakow I. et al., The EGSnrc Code System: Monte Carlo simulation of electron and photon transport, Technical Report PIRS-701, 2017, National Research Council Canada.
7. Poludniowski G. et al., Phys. Med. Biol., 2009, vol. 54, no. 433а. https://doi.org/10.1088/0031-9155/54/19/N01
Review
For citations:
Villevalde A.Y., Oborin A.V. National primary special standard of absorbed dose and adsorbed dose rate to tissue-equivalent material for X-rays with limiting photon energy from 10 to 60 keV GET 73-2022. Izmeritel`naya Tekhnika. 2022;(7):8-12. (In Russ.) https://doi.org/10.32446/0368-1025it.2022-7-8-12
Views:
186
Email this article 