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Optimization of conditions for topaz irradiation in the WWR-K reactor

Darkhan S. Sairanbayev
Darkhan S. Sairanbayev
, 
Asset A. Shaimerdenov
Asset A. Shaimerdenov
, 
Magzhan T. Aitkulov
Magzhan T. Aitkulov
 und 
Shamil Kh. Gizatulin
Shamil Kh. Gizatulin
   | 25. Juni 2024
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Article Category: Original Paper
Online veröffentlicht: 25. Juni 2024
Seitenbereich: 129 - 133
Eingereicht: 03. Okt. 2023
Akzeptiert: 15. Feb. 2024
DOI: https://doi.org/10.2478/nuka-2024-0019
Schlüsselwörter
© 2024 Darkhan S. Sairanbayev et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Layout of the irradiation device: (a) appearance; (b) three-dimensional cross-sectional image.
Layout of the irradiation device: (a) appearance; (b) three-dimensional cross-sectional image.

Fig. 2.

Appearance of a sandwich screen made of tantalum foil and boron carbide: 1 – screen made of boron carbide, 2 – screen made of tantalum, 3 – end tantalum screen of a round shape, 4 – screen of boron carbide of a round shape, 5 – view of a sandwich screen assembled.
Appearance of a sandwich screen made of tantalum foil and boron carbide: 1 – screen made of boron carbide, 2 – screen made of tantalum, 3 – end tantalum screen of a round shape, 4 – screen of boron carbide of a round shape, 5 – view of a sandwich screen assembled.

Fig. 3.

The core of the critical facility. AD, aluminum displacer; CR, type 2 fuel assemblies with an absorbing rod; FA, type 1 fuel assemblies; IC, irradiation channel; NS, neutron source.
The core of the critical facility. AD, aluminum displacer; CR, type 2 fuel assemblies with an absorbing rod; FA, type 1 fuel assemblies; IC, irradiation channel; NS, neutron source.

Fig. 4.

Non-irradiated topaz.
Non-irradiated topaz.

Fig. 5.

Dynamics of changes in the induced activity of a tantalum monitor.
Dynamics of changes in the induced activity of a tantalum monitor.

The flux density of thermal and fast neutrons in the layout of the irradiation device

Configuration Neutron flux density (cm−2·s−1)
En <0.625 eV En >1.15 MeV
Empty layout (1.28 ± 0.11) × 109 (2.38 ± 0.20) × 108
Layout with topaz (8.76 ± 0.62) × 108 (2.45 ± 0.19) × 108
Model with boron carbide screen and topaz (1.72 ± 0.14) × 108 (2.15 ± 0.18) × 108
Layout with sandwich screen and topaz (1.54 ± 0.62) × 108 (2.28 ± 0.17) × 108

Nuclear physical characteristics of activation detectors

Detector type Gold Indium
Neutron energy region Thermal Fast
Energy threshold 0 ≤ En ≤ 0.625 eV En >1.15 MeV
Nuclear reactions 197Au(n,γ)198Au 115In(n,n′)115mIn
Half-life 2.696 days 4.486 h
Reaction cross-section (barn) 98.7 0.286

Critical facility characteristics

Reactor type Tank
Thermal power (W) 100
Reflector Light water and/or beryllium
Moderator Light water and/or beryllium
Maximum thermal neutron flux (cm−2·s−1) 3 × 109
Maximum fast neutron flux (cm−2·s−1) 2 × 108
Fuel composition UO2 + Al
U-235 enrichment (%) 19.7
Experimental channel’s diameter (mm) 65, 96, 140

Radionuclide composition of topaz after each stage of experiments

Layout type Specific activity (Bq·g−1)
Ga-72 (T1/2 = 14.1 h) Na-24 (T1/2 = 14.9 h) Ta-182 (T1/2 = 114 days)
Layout without a screen 1290 ± 70 28 658 ± 1146 23 ± 3
Layout with boron carbide screen 316 ± 16 12 600 ± 447 15 ± 4
Layout with sandwich screen 302 ± 43 13 666 ± 548 –
eISSN:
1508-5791
Sprache:
Englisch
Zeitrahmen der Veröffentlichung:
4 Hefte pro Jahr
Fachgebiete der Zeitschrift:
Chemie, Nuklearchemie, Physik, Astronomie und Astrophysik, andere
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