ГЭТ 8-2019 (НИО 210)
Standard name:
- ГЭТ 8-2019 State Primary Standard of Air Kerma, Air Kerma Rate, Exposure Dose, Exposure Dose Rate, and Energy Flux of X-ray and Gamma Radiation
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:
- Oborin Alexander Veniaminovich
Year of creation:
- 2019
Year of re-confirmation:
- 2019
Operating principle:
An ionization method based on measuring the ionization effect that occurs in a substance within the sensitive volume of a free-air or cavity ionization chamber under the influence of X-ray or gamma radiation.
A calorimetric method based on measuring the thermal energy received by a calorimetric detector as a result of the conversion of transmitted X-ray energy into thermal energy.
Composition of the standard:
- The UED 5-50M unit with free-air ionization chambers for reproducing air kerma units, air kerma rate, exposure dose, and X-ray exposure dose rate at a generation voltage of 5 to 50 kV;
- The UED 50-320 unit with free-air ionization chambers for reproducing air kerma units, air kerma rate, exposure dose, and X-ray exposure dose rate at a generation voltage of 50 to 320 kV;
- The PIKE-1 facility with a set of graphite cavity ionization chambers for reproducing units of air kerma, air kerma rate, exposure dose, and exposure dose rate of gamma radiation with photon energies from 0.2 to 3 MeV;
- The UEK-1 facility with calorimeters for reproducing units of X-ray energy flux at generation voltages from 5 to 200 kV;
- A set of variable-composition gamma radiation sources (IGI);
- A KPK-1 comparator (a set of cavity ionization chambers with a volume of 0.02 to 10,000 cm[^3]) for transferring units from the primary standard to secondary and working standards;
- A spectrometer based on a GLP-06165/05P5 semiconductor detector for determining the energy distribution of X-ray radiation.
Main metrological characteristics
| Gamma-ray energy range | 0.2 - 3 MeV |
| X-ray generation voltage range | 5 - 320 kV |
| Measurement range | Air kerma 1 10-7 - 20 Gy |
| Air kerma rate 1 10-8 - 2 Gy/s | |
| Exposure dose 3 x 10-9 - 6 x 10-1 C/kg | |
| Exposure dose rate 3 x 10-10 - 6 x 10-2 A/kg | |
| Energy flux 2 x 10-5 - 2 x 10-4 W | |
| Estimated random error of units | Kerma and air kerma rate 1.1 x 10-3 - 1.5 x 10-3 |
| Exposure dose and exposure dose rate 1.1 x 10-3 - 1.5 x 10-3 | |
| Energy flux 1 x 10-2 | |
| Estimation of the unremoved systematic error of reproduction | air kerma and kerma rate 4.2 x 10-3 - 1.1 x 10-2 |
| exposure dose and exposure dose rate 3.7 x 10-3 - 8.2 x 10-3 | |
| energy flux 2.5 x 10-2 | |
| Standard uncertainty, estimated according to Type A | air kerma and air kerma rate of X-ray and gamma radiation 1.1 x 10-3 - 1.5 x 10-3 |
| Exposure dose and exposure dose rate of X-ray and gamma radiation 1.1 x 10-3 - 1.5 x 10-3 | |
| X-ray energy flux 1 x 10-2 | |
| Type B estimated standard uncertainty | air kerma and X-ray and gamma air kerma rate 1.7 x 10-3 - 4.6 x 10-3 |
| exposure dose and X-ray and gamma exposure dose rate 1.5 x 10-3 - 3.4 x 10-3 | |
| X-ray energy flux 1.0 10-2 | |
| Total standard uncertainty | air kerma and X-ray and gamma air kerma rate 2.0 x 10-3 - 4.8 x 10-3 |
| exposure dose and X-ray and gamma air kerma rate 1.9 x 10-3 - 3.7 x 10-3 | |
| energy flux X-ray radiation 1.4·10-2 | |
| Expanded uncertainty with coverage factor k=2 | air kerma and air kerma rate of X-ray and gamma radiation 4.0 x 10-3 - 9.6 x 10-3 |
| exposure dose and exposure dose rate of X-ray and gamma radiation 3.8 x 10-3 - 7.4 x 10-3 | |
| X-ray energy flux 2.8 10-2 |
Verification diagram:
- Heads the state verification scheme for measuring instruments for air kerma, air kerma rate, exposure dose, exposure dose rate, ambient, directional and personal dose equivalents, ambient, directional and personal dose equivalent rates and X-ray and gamma radiation energy flux
Scope of application:
Dosimetric measurements of X-ray and gamma radiation are used in many areas:
- Medicine and sanitation;
- Ecology;
- Nuclear power;
- Nuclear instrumentation;
- Military affairs and defense technologies;
- Non-destructive testing;
- Geophysics and geology;
- Biophysics and biology;
- Cosmonautics;
- Banking business;
- Customs control;
- Civil defense and emergency response, etc.
Results of applying the standard:
Not specified
The total number of measuring instruments traceable to ГЭТ 8-2019:
The park of measuring instruments traceable to the standard includes more than 10,000,000 dosimetric measuring instruments.
PHOTO:
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