ГЭТ 10-2023 (НИО 210)
Standard name:
- ГЭТ 10-2023 State Primary Standard of Units of Neutron Flux and Flux Density
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:
- Moiseev Nikolay Nikolaevich
Year of creation:
- 1969
Year of re-confirmation:
- 2023
Operating principle:
-
Neutron flux units and flux density are reproduced:
- By registering accompanying charged particles;
- By thermalizing fast neutrons in various moderating media, followed by registering thermal neutrons using activation detectors or gas-filled counters.
-
Transfer of neutron flux and flux density units to secondary and working standards is carried out:
- By direct measurements;
- By comparison using a comparator;
- By direct comparison.
-
Composition of the standard:
The operation of the standard is ensured by a set of measuring instruments included in its composition:
- The UEN-1 setup for measuring neutron flux by recording accompanying particles, the main elements of which are a fast monoenergetic neutron generator and a spherical all-wave comparator made of pure reactor-grade graphite;
- The UEN-2 setup for measuring neutron flux from radionuclide sources by activating an aqueous solution of manganese sulfate;
- The UEPPN facility for reproducing and transmitting the unit size of the neutron flux density over a wide energy range, including a measuring bench, a UKPN-type fast and thermal neutron field former, an OVS-type all-wave radiometer, a fast monoenergetic neutron generator, and a set of radionuclide neutron sources with various spectral compositions;
- The UEPTN facility for storing and transmitting the unit size of the thermal neutron flux density.
Main metrological characteristics
| Measurement range | 1 102 - 1 109 s-1; 1 105 - 1 1014 s-1 m-2 |
| Estimate of random error of unit reproduction | 0.002 - 0.005 |
| Estimate of unexcluded systematic error of unit reproduction | 0.004 - 0.009 |
| Type B estimated standard uncertainty in neutron flux | 1.6 x 10-3 - 3.7 x 10-3 |
| Type B estimated standard uncertainty in neutron flux density | 1.2 x 10-3 - 4.1 x 10-3 |
| Total standard uncertainty in neutron flux | 2.6 x 10-3 - 6.2 x 10-3 |
| Total standard uncertainty in neutron flux density | 1.6 x 10-3 - 6.5 x 10-3 |
| Expanded uncertainty in neutron flux | 5.2 x 10-3 - 1.2 x 10-2 |
| Expanded uncertainty in neutron flux density | 3.2 x 10-3 - 1.3 x 10-2 |
Verification diagram:
- Heads the state verification scheme for instruments measuring neutron flux and flux density
Scope of application:
- Fundamental research: measurement of nuclear constants and cross-sections of neutron interactions with structural materials;
- Medicine: radiation therapy;
- Power engineering: monitoring the functioning of reactor control, protection, and safety systems;
- Defense: monitoring nuclear weapons production, military and naval radiation reconnaissance devices;
- Materials science: radiation technologies for producing materials with new properties, non-destructive analysis of substance composition.
Results of applying the standard:
Not specified
The total number of measuring instruments traceable to ГЭТ 10-2023:
Tens of thousands.
Ensuring the uniformity of measurements, participation in the CIPM MRA program:
No comparisons were conducted
PHOTO:
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