ГЭТ 9-2018 (НИО 210)
Standard name:
- ГЭТ 9-2018 State Primary Standard of Units of Absorbed Dose and Absorbed Dose Rate of Beta Radiation in Tissue-Equivalent Material
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:
- Fedina Svetlana Alexandrovna
Year of creation:
- 1969
Year of re-confirmation:
- 2018
Operating principle:
The reproduction of the units of absorbed dose and absorbed dose rate of beta radiation by the standard is based on direct measurements of the ionization current in an automated extrapolation ionization chamber in the fields of dosimetric beta radiation sources with a maximum energy of 3.5 MeV.
Composition of the standard:
The primary standard consists of a set of the following technical means and auxiliary devices:
- the UEDAB-1 measuring setup with the MEK-1 automated ionization extrapolation chamber for reproducing absorbed dose units in the range from 3 x 10-4 to 1 x 10-1 Gy and the absorbed dose rate of beta radiation in the range from 5 x 10-6 to 1 x 10-3 Gy/s;
- the UEDB-2 measuring setup with the EK-2M ionization extrapolation chamber for reproducing absorbed dose units in the range from 1 x 10-1 to 1 x 102 Gy and the absorbed dose rate of beta radiation in the range from 1 x 10-3 to 1 Gy/s;
- TEB-1 transportable kit with a fixed-volume plane-parallel ionization chamber;
- a set of radionuclide beta-radiation sources of variable composition NRIB-1.
Main metrological characteristics
| Characteristics | Name of the physical quantity | |
|---|---|---|
| Absorbed dose | Absorbed dose rate | |
| Measurement range | 3 10-4 – 1 102 Gy | 5 10-6 – 1 Gy/s |
| S0 | 1·10-2 | |
| q0 | 2,0·10-2 – 2,9·10-2 | |
| u0A | 1·10-2 | |
| u0B | 8,3·10-3 – 1,2·10-2 | |
| u0C | 1,3·10-2 – 1,6·10-2 | |
| U0 | 2,6·10-2 – 3,2·10-2 | |
Verification diagram:
- Heads the state verification scheme for measuring instruments for absorbed dose, absorbed dose rate of beta radiation in tissue-equivalent material, directional and individual dose equivalents of beta radiation, and their rates. Approval Order No. 2499 dated October 22, 2019.
Scope of application:
Medicine, nuclear industry, radiation dosimetry, ecology, exploration and extraction of mineral deposits, space and defense technologies
Results of applying the standard:
Primary and periodic certification of working standards of beta radiation (dosimetric installations and sources), verification and calibration of measuring instruments in the field of beta radiation.
The total number of measuring instruments traceable to ГЭТ 9-2018:
About a thousand
Ensuring the uniformity of measurements, participation in the CIPM MRA program:
Comparisons: EUROMET.RI(I)-S2, EUROMET.RI(I)-S2.B1, EUROMET.RI(I)-S2.B2, Bilateral comparisons VNIIM-RTV
SMS lines:
COO-RAD-VNIIM-1111 (1.11.3), COO-RAD-VNIIM-1112 (1.11.3), COO-RAD-VNIIM-1113 (1.9.3), COO-RAD-VNIIM-1114 (1.9.3), COO-RAD-VNIIM-1115 (1.4.3), COO-RAD-VNIIM-1116 (1.4.3),
COO-RAD-VNIIM-1117 (1.4.3)
PHOTO:
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/Набор источников НРИБ-1.png)
NRIB-1 source set
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/Транспортируемый комплект ТЭБ-1.png)
Transportable set TEB-1
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/Эталонная измерительная установка УЭДАБ-1.png)
Standard measuring installation UEDAB-1
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/Эталонная измерительная установка УЭДБ-2.png)
Standard measuring unit UEDB-2