Abstract
A Bonner sphere spectrometer (BSS) was developed for neutron diagnostic on HL_2A Tokamak. It contains eight polyethylene spheres embedded with SP9 3He proportional counter. Before setting up on the Tokamak experimental hall, a verification experiment was arranged on a 241Am–Be neutron source to test its spectrometry capability. The neutron response functions were calculated by Monte Carlo code Geant4 to simulate the real measurement environments. By least square method, the neutron spectrum was finally unfolded on log domain from 0.1 eV to 11 MeV. It has a remarkable consistency to the ISO 8529-1 standard 241Am–Be neutron spectrum. This shows that the BSS is effective and reliable for neutron spectrum determination.
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D.J. Thomas, A.V. Alevra, Bonner sphere spectrometers—a critical review. Nucl. Instrum. Methods A 476, 12–20 (2002). doi:10.1016/S0168-9002(01)01379-1
S.T. Wu, An overview of the EAST project. Fusion Eng. Des. 82, 463–471 (2007). doi:10.1016/j.fusengdes.2007.03.012
Z.M. Hu, X.F. Xie, Z.J. Chen et al., Monte Carlo simulation of a Bonner sphere spectrometer for application to the determination of neutron field in the experimental advanced superconducting Tokamak experimental hall. Rev. Sci. Instrum. 85, 11E417 (2014). doi:10.1063/1.4891163
R.L. Bramblett, R.I. Ewing, T.W. Bonner, A new type of neutron spectrometer. Nucl. Instrum. Methods 9, 1–4 (1960). doi:10.1016/0029-554X(60)90043-4
V. Mares, H. Schraube, Evaluation of the response matrix of a Bonner sphere spectrometer with Lil detector from thermal energy to 100 MeV. Nucl. Instrum. Methods A 337, 461–473 (1994). doi:10.1016/0168-9002(94)91116-9
U. Schneider, S. Agosteo, E. Pedroni et al., Secondary neutron dose during proton therapy using spot scanning. Int. J. Radiat. Oncol. Biol. Phys. 53, 244–251 (2002). doi:10.1016/S0360-3016(01)02826-7
N. Mirzajani, R. Ciolini, G. Curzio, Analysis of the application of the shadow cone technique for the determination of neutron spectrum with Bonner sphere spectrometer. Nucl. Instrum. Methods A 722, 24–28 (2009). doi:10.1016/j.nima.2009.02.044
J.L. Benites-Rengifo, H.R. Vega-Carrillo, J. Velazques-Fernandez, Photoneutron spectrum measured with a Bonner sphere spectrometer in planetary method mode. Appl. Radiat. Isot. 83, 256–259 (2014). doi:10.1016/j.apradiso.2013.04.001
R. Khabaz, Study of a new multi-sphere spectrometer based on water moderator with a high efficiency 6LiI(Eu) detector. J. Radioanal. Nucl. Chem. 293, 383–389 (2012). doi:10.1007/s10967-012-1748-4
Y. Liu, X.T. Ding, Q.W. Yang et al., Recent advances in the HL-2A tokamak experiments. Nucl. Fusion 45, S239–S244 (2005). doi:10.1088/0029-5515/45/10/S19
S. Garny, V. Mares, W. Ruhm, Response functions of a Bonner sphere spectrometer calculated with GEANT4. Nucl. Instrum. Methods A 604, 612–617 (2009). doi:10.1016/j.nima.2009.02.044
H.R. Vega-Carrillo, E. Gallego, A. Lorente, Response matrix calculation of a Bonner sphere spectrometer based on A 6Lil(Eu) scintillator. Nucl. Technol. 168, 359–363 (2009)
R. Bedogni, C. Domingo, A. Esposito et al., FRUIT: an operational tool for multisphere neutron spectrometry in workplaces. Nucl. Instrum. Methods A 580, 1301–1309 (2007). doi:10.1016/j.nima.2007.07.033
M. Matzke, Unfolding procedures. Radiat. Prot. Dosim. 107, 155–174 (2003). doi:10.1093/oxfordjournals.rpd.a006384
C.S. Zaidins, J.B. Martin, F.M. Edwards, A least-squares technique for extracting neutron spectra from Bonner sphere data. Med. Phys. 5, 42–45 (1978). doi:10.1118/1.594464
B. Wiegel, A.V. Alevra, NEMU—the PTB neutron multisphere spectrometer: Bonner spheres and more. Nucl. Instrum. Methods A 476, 36–41 (2002). doi:10.1016/s0168-9002(01)01385-7
R. Bedogni, C. Domingo, N. Roberts et al., Investigation of the neutron spectrum of americium–beryllium sources by Bonner sphere spectrometry. Nucl. Instrum. Methods A 763, 547–552 (2014). doi:10.1016/j.nima.2014.06.040
ISO 8529-1, Reference neutron radiations—part 1: characteristic and methods of productions. International Organization for Standardization, 56, CH-1211, Geneva (2001)
Y.M. Li, J.X. Chen, G.H. Zhang et al., Study of physical characteristic for compressed-mixture type 241Am O2-Be neutron source. At. Energy Sci. Technol. 47, 1–6 (2013). doi:10.7538/yzk.2013.47.01.0001. (in Chinese)
S. Agostinelli, J. Allison, K. Amako et al., Geant4—a simulation toolkit. Nucl. Instrum. Methods A 506, 250–303 (2003). doi:10.1016/S0168-9002(03)01368-8
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This work was supported by the National Natural Science Foundation of China (Nos. 11375195 and 11375263) and National Magnetic Confinement Fusion Science Program of China (No. 2013GB104003).
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Cao, J., Jiang, CY., Yang, QW. et al. Verification of a fusion neutron diagnostic Bonner sphere spectrometer on measurement of a 241Am–Be neutron source. NUCL SCI TECH 27, 128 (2016). https://doi.org/10.1007/s41365-016-0126-2
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DOI: https://doi.org/10.1007/s41365-016-0126-2