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Conversion of fast neutrons for neutron radiography with TPX2 detector Cover

Conversion of fast neutrons for neutron radiography with TPX2 detector

Nukleonika
Volume 69 (2024): Issue 2 (June 2024)
By: Andrea Šagátová,  Marko Fülöp,  Andrej Novák,  Branislav Vrban,  Jakub Lüley,  Štefan Čerba,  Ivan Benkovský and  Bohumír Zaťko  
Open Access
|Jun 2024

Figures & Tables

Fig. 1.

Schematic cross-section view of TPX2 chip bump-bonded to Si sensor with examples of neutron registration: through conversion in polyethylene (left) or by nuclear reaction with Si nucleus (right).
Schematic cross-section view of TPX2 chip bump-bonded to Si sensor with examples of neutron registration: through conversion in polyethylene (left) or by nuclear reaction with Si nucleus (right).

Fig. 2.

The photograph of the MiniPIX TPX2 detector with applied layers (left). The X-ray image of the layers applied on the sensor substrate (middle). Areas of the sensor covered by different converter layers in color (right).
The photograph of the MiniPIX TPX2 detector with applied layers (left). The X-ray image of the layers applied on the sensor substrate (middle). Areas of the sensor covered by different converter layers in color (right).

Fig. 3.

Arrangement of experimental testing of the TPX2 detector by fast neutrons.
Arrangement of experimental testing of the TPX2 detector by fast neutrons.

Fig. 4.

Tracks of the first 2000 particles registered by the TPX2 detector with applied filtration are described in the left column for two energies of interacting neutrons: 3.55 MeV (middle column) and 15.7 MeV (right column).
Tracks of the first 2000 particles registered by the TPX2 detector with applied filtration are described in the left column for two energies of interacting neutrons: 3.55 MeV (middle column) and 15.7 MeV (right column).

Fig. 5.

The cross-sections of selected reactions on 28Si and elastic scattering on 1H, 12C, 14N, and 16O as a function of neutron kinetic energy obtained from ENDF/B-VII.1 [24].
The cross-sections of selected reactions on 28Si and elastic scattering on 1H, 12C, 14N, and 16O as a function of neutron kinetic energy obtained from ENDF/B-VII.1 [24].

Selected interactions of fast neutrons in Si sensor and conversion layer with their Q values and total energy of recoils for interacting neutrons with kinetic energy of 3_55 MeV and 15_7 MeV with parameters for elastic scattering on hydrogen in the converter layer

InteractionQ value (MeV)Total kinetic energy of charged recoils (MeV)
@ 3.55 MeV neutrons@ 15.7 MeV neutrons
28Si(n,n′)28Si (elastic sc.)0up to 0.47up to 2.09
28Si(n,n′)28Si*−1.7791.77113.921
28Si(n,α)25Mg−2.6540.89613.046
28Si(n,α)25Mg*−3.2390.31112.461
28Si(n,α)25Mg**−3.628−12.072
28Si(n,α)25Mg***−4.266−11.434
28Si(n,α)25Mg****−4.618−11.082
28Si(n,α)25Mg*****−5.455−10.245
28Si(n,α)25Mg******−6.059−9.641
28Si(n,p)28Al−3.860−11.840
28Si(n,d)27Al−9.360−6.340
28Si(n,γ)29Si8.47412.02424.174
H(n,p)n0up to 3.55up to 15.7

Projected ranges of protons in converter layers applied on the sensor surface according to SRIM [21]

Proton energy (MeV)Kapton polyimide film C22H10N2O5 (1.42 g/cm3, 10 μm)Polyethylene (C2H4)n (0.93 g/cm3, 50–150 μm)
Projected range (μm)
3.55152.24190
15.7020902700
DOI: https://doi.org/10.2478/nuka-2024-0020 | Journal eISSN: 1508-5791 | Journal ISSN: 0029-5922
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Language: English
Page range: 135 - 140
Submitted on: Nov 21, 2023
|
Accepted on: May 8, 2024
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Published on: Jun 25, 2024
Published by: Institute of Nuclear Chemistry and Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
Hybrid pixel detector,
Neutron conversion,
Neutron radiography,
Timepix2
Related subjects:
Chemistry,
Nuclear chemistry,
Physics,
Astronomy and astrophysics,
Physics, other

© 2024 Andrea Šagátová, Marko Fülöp, Andrej Novák, Branislav Vrban, Jakub Lüley, Štefan Čerba, Ivan Benkovský, Bohumír Zaťko, published by Institute of Nuclear Chemistry and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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