ГЭТ 134-82 (НИО 210)
Standard name:
- ГЭТ 134-82 State primary special standard of units of exposure dose, exposure dose rate, flux and flux density of pulsed X-ray 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:
- Grishin Denis Sergeevich
Year of creation:
- 1982
Year of re-confirmation:
- 1982
Operating principle:
The standard for measuring exposure dose and average exposure dose rate is based on the ionization method, which measures the ionization effect that occurs in the air within the sensitive volume of an ionization chamber under the influence of pulsed X-ray radiation. When measuring the average flux and average energy flux density, a calorimetric method is used, based on measuring the thermal energy of the total absorption of pulsed X-ray photons in a calorimeter.
Composition of the standard:
- Plane-parallel gas-filled ionization chamber КИ-1;
- Isothermal differential calorimeter КЛ-1;
- Registration system;
- Pulsed X-ray system ИРИ-1;
- Pulsed X-ray system ИРИ-2.
Main metrological characteristics
| Unit | Meaning | S0 | q0 | u0A | u0B | u0C | U0 ( k = 2) |
|---|---|---|---|---|---|---|---|
| Exposure dose, C/kg | 8 × 10-7 – 3 × 10-4 | 1 × 10-2 | 3 × 10-2 | 1 × 10-2 | 1.2 × 10-2 | 1.6 × 10-2 | 3.2 × 10-2 |
| Average exposure dose rate, A/kg | 8 × 10-9 – 3 × 10-5 | ||||||
| Average energy flux, W | 5 × 10-6 – 3 × 10-5 | 2 × 10-2 | 4 × 10-2 | 2 × 10-2 | 1.6 × 10-2 | 2.6 × 10-2 | 5.2 × 10-2 |
| Average energy flux density, W/m2 | 1 × 10 -2 – 1 × 10 -1 |
Verification diagram:
- Heads the state verification scheme for measuring instruments of exposure dose, average exposure dose rate, average flux and average energy flux density of pulsed X-ray radiation
Scope of application:
- Experimental Nuclear Physics of Fast Processes;
- Astrophysical and Space Research;
- Nuclear and Fusion Power;
- Flaw Detection in Mechanical Engineering, Aircraft and Shipbuilding, and Oil and Gas Transportation;
- Medicine and Sanitation;
- Biology, etc.
Results of applying the standard:
The standard ensures the reproduction of units of exposure dose and average exposure dose rate of pulsed X-ray radiation with an unexcluded systematic error of 3% and a standard deviation of 1%; the average flux and average flux density of pulsed X-ray energy with an unexcluded systematic error of 4% and a standard deviation of 2%. The creation of the standard in 1982 led to a wider and more effective use of pulsed X-ray machines, tubes, and measuring instruments produced in the country.
Work is currently underway to improve the standard, aimed at:
- Expansion of the range of reproducible quantities: reproduction of air kerma and average air kerma power along with exposure dose, average exposure dose power, average energy flux and average energy flux density of pulsed X-ray radiation;
- Expansion of the standard's functional capabilities by reproducing units of quantities in an extended range of pulse durations (a millisecond range is added to the existing nanosecond and microsecond ranges);
- Expansion of the range of reproduction of units of measurement by 3 times;
- Increasing the level of automation of reference measurement processes. Completion of work is scheduled for Q4 2026.
The total number of measuring instruments traceable to ГЭТ 134-82:
Hundreds
Ensuring the uniformity of measurements, participation in the CIPM MRA program:
No comparisons were conducted
Unique technical installations as part of the standard:
Plane-parallel gas-filled ionization chamber KI-1; isothermal differential calorimeter KL-1; pulsed X-ray radiation unit IRI-1; pulsed X-ray radiation unit IRI-2.
PHOTO:
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