Neutronics Analyses of the Radiation Field at the Accelerator-Based Neutron Source of Nagoya University for the BNCT Study
Abstract
:1. Introduction
2. Methods
2.1. NUANS Facility
2.2. Computational Methods
2.3. Neutron and Gamma-ray Source Term at the Lithium Target
3. Results
3.1. Radiation Field Inside the Irradiation Room
3.2. Radiation Field at the BSA Outlet and the Vicinity
3.3. Radiation Field in the Water Phantom and Vials
4. Discussion
5. Conclusions
Author Contributions
Funding
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Parameters | PHITS Calculation | IAEA Recommendation |
---|---|---|
Epithermal neutron flux (1/cm2/s) ϕepi | (8.04 ± 0.03) × 108 (at 15 mA) | ≥1 × 109 |
Fast neutron flux (1/cm2/s) ϕf | (1.42 ± 0.01) × 108 (at 15 mA) | No recommendation |
Thermal neutron flux (1/cm2/s) ϕth | (5.31 ± 0.53) × 106 (at 15 mA) | No recommendation |
Thermal neutron flux ratio ϕth/ϕepi | 0.0066 ± 0.0004 | ≤0.05 |
Ratio of Epithermal neutron current to Epithermal neutron flux Cepi/ϕepi | 0.726 ± 0.006 | ≥0.7 |
Fast neutron dose per epithermal neutron flux (Gy cm2) Df/ϕepi | (5.28 ± 0.08) × 10−13 | ≤2 × 10−13 |
Gamma-ray dose per epithermal neutron flux (Gy cm2) Dg/ϕepi | (1.00 ± 0.19) × 10−13 | ≤2 × 10−13 |
Vial number | #1 | #4 | #7 |
Thermal neutron flux (×107/cm2 s/mA) | 6.49 ± 0.01 | 7.17 ± 0.01 | 6.49 ± 0.01 |
Fast neutron flux (×106/cm2 s/mA) | 6.20 ± 0.02 | 7.36 ± 0.02 | 6.40 ± 0.02 |
Gamma-ray flux (×106/cm2 s/mA) | 7.37 ± 0.01 | 7.87 ± 0.01 | 7.41 ± 0.01 |
Vial number | #2 | #5 | #8 |
Thermal neutron flux (× 107/cm2 s/mA) | 7.77 ± 0.01 | 8.49 ± 0.01 | 7.75 ± 0.01 |
Fast neutron flux (×106/cm2 s/mA) | 6.89 ± 0.02 | 7.89 ± 0.02 | 7.05 ± 0.02 |
Gamma-ray flux (×106/cm2 s/mA) | 8.40 ± 0.01 | 9.01 ± 0.01 | 8.82 ± 0.01 |
Vial number | #3 | #6 | #9 |
Thermal neutron flux (×107/cm2 s/mA) | 6.69 ± 0.01 | 7.38 ± 0.01 | 6.71 ± 0.01 |
Fast neutron flux (×106/cm2 s/mA) | 6.23 ± 0.02 | 7.30 ± 0.02 | 6.38 ± 0.02 |
Gamma-ray flux (×106/cm2 s/mA) | 7.52 ± 0.01 | 8.09 ± 0.01 | 7.54 ± 0.01 |
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Nishitani, T.; Yoshihashi, S.; Tanagami, Y.; Tsuchida, K.; Honda, S.; Yamazaki, A.; Watanabe, K.; Kiyanagi, Y.; Uritani, A. Neutronics Analyses of the Radiation Field at the Accelerator-Based Neutron Source of Nagoya University for the BNCT Study. J. Nucl. Eng. 2022, 3, 222-232. https://doi.org/10.3390/jne3030012
Nishitani T, Yoshihashi S, Tanagami Y, Tsuchida K, Honda S, Yamazaki A, Watanabe K, Kiyanagi Y, Uritani A. Neutronics Analyses of the Radiation Field at the Accelerator-Based Neutron Source of Nagoya University for the BNCT Study. Journal of Nuclear Engineering. 2022; 3(3):222-232. https://doi.org/10.3390/jne3030012
Chicago/Turabian StyleNishitani, Takeo, Sachiko Yoshihashi, Yuuki Tanagami, Kazuki Tsuchida, Shogo Honda, Atsushi Yamazaki, Kenichi Watanabe, Yoshiaki Kiyanagi, and Akira Uritani. 2022. "Neutronics Analyses of the Radiation Field at the Accelerator-Based Neutron Source of Nagoya University for the BNCT Study" Journal of Nuclear Engineering 3, no. 3: 222-232. https://doi.org/10.3390/jne3030012