ГЭТ 73-2022 (НИО 210)

Standard name:

ГЭТ 73-2022 State primary special standard of units of absorbed dose and absorbed dose rate in tissue-equivalent material of X-ray radiation with a cutoff photon energy from 10 to 60 keV

Type of measurement:

Measurements of ionizing radiation characteristics and nuclear constants

Structural division: name НИО\НИЛ:

Research Department for Measurements of Ionizing Radiation

Guardian Scientist:

Zhukov Grigory Vasilievich, Candidate of Technical Sciences

Year of creation:

1973

Year of re-confirmation:

2022

Operating principle:

- Reproduction of the absorbed dose unit and the absorbed dose rate in tissue-equivalent material (in water) is carried out using the ionization method, based on the ionization of atoms and molecules under the influence of ionizing radiation, with subsequent registration using the standard extrapolation ionization chambers EK-R and EK-I, whereby the increment of the ionization charge with an increase in the measuring volume of the chamber is proportional to the absorbed dose in the differential volume of air in the chamber.
- Reproduction of the absorbed dose unit in graphite under special conditions is carried out by the calorimetric method using the KD-R standard calorimeter, whereby the energy of the incident X-ray radiation is converted into thermal energy in the measuring absorber of the calorimeter.

Composition of the standard:

The КД-Р standard calorimeter for reproducing the absorbed dose unit in graphite under special conditions;
The ЭК-Р standard extrapolation ionization chamber for reproducing the absorbed dose unit and absorbed dose rate in tissue-equivalent material (in water) from low-energy X-ray sources;
The ЭК-Иstandard extrapolation ionization chamber for reproducing absorbed dose units and absorbed dose rates in tissue-equivalent material (in water) from radionuclide X-ray sources;
The ИС automated measuring system;
The ТК transportable kit based on cavity ionization chambers and a solid-state phantom;
The КИ set of variable-composition radionuclide X-ray sources;

Verification diagram:

Heads the state verification scheme for measuring instruments for absorbed dose and absorbed dose rate of X-ray radiation in the range of photon boundary energies from 10 to 60 keV

Scope of application:

Radiation therapy using low-energy X-rays, including brachytherapy with low-dose-rate radionuclide sources

Results of applying the standard:

Absorbed dose (absorbed dose rate) in tissue-equivalent material (water) is reproduced in the range from 0.01 to 200 Gy (1 x 10^-4–2 Gy/s) with expanded uncertainty (with a coverage factor of k = 2) U0 in the range from 2 to 2.8%; absorbed dose in graphite under special conditions is reproduced in the range from 1 to 5 Gy with expanded uncertainty (with a coverage factor of k = 2) U0 = 2.2%.The results of the standard improvement correspond to the strategic and priority areas of development of the Russian Federation in terms of the transition to high-tech healthcare and health-preserving technologies (Strategy for Ensuring the Uniformity of Measurements in the Russian Federation until 2025; National Project "Healthcare"; National Oncology Program 2030) and are associated with the implementation of the principles of state policy in the field of nuclear and radiation safety.The effect of the implementation of the improved standard is largely aimed at improving the quality of life of patients through accurate dose measurement during low-energy X-ray radiation therapy, and especially brachytherapy.

The total number of measuring instruments traceable to ГЭТ 73-2022:

Hundreds of units

Ensuring the uniformity of measurements, participation in the CIPM MRA program:

1

СМС string identification: COOMET-RI-RU-00000HZQ-1

Unique technical installations as part of the standard:

Standard calorimeter КД-Р; standard extrapolation ionization chamber ЭК-Р; standard extrapolation ionization chamber ЭК-И.

PHOTO:

КД-Р reference calorimeter for reproducing the unit of absorbed dose in graphite under special conditions
Standard extrapolation ionization chamber ЭК-Р to reproduce the absorbed dose units and absorbed dose rate in tissue-equivalent material (in water) from low-energy X-ray generating sources
Standard extrapolation ionization chamber ЭК-И to reproduce the absorbed dose units and absorbed dose rate in tissue-equivalent material (water) from radionuclide X-ray sources

Information in the Federal State Information System "ARSHIN"