Abstract
Recently, Sandia Laboratories developed a neutron scatter camera to detect special nuclear materials. This camera exhibits the following advantages: high efficiency, direction discrimination, neutron-gamma discrimination ability, and wide field of view. However, using the direct projection method, the angular resolution of this camera is limited by uncertainties in the energies estimated from pulse height and time of flight measurements. In this study, we established an eight-element neutron scatter camera and conducted the experiment with a 252Cf neutron source. The results show that it has an angular resolution better than 8° (1σ) and a detection efficiency of approximately 2.6×10-4. Using maximum likelihood expectation maximization method, the image artifact was eliminated, and the angular resolution was improved. We proposed an average scattering angle method to estimate the scattering energy of neutrons and Compton gamma rays. As such, we can obtain a recognizable image and energy spectrum of the source with some degradation of energy and image resolutions. Finally, a newly measured light response function based on the MPD-4 device was used for image reconstruction. Although we did not obtain a better result than that of the standard light response function, we have observed the effects of light response function on image reconstruction.
Similar content being viewed by others
References
Runkle R C, Bernstein A, Vanier P E, et al. Detection of special nuclear material in cargo containers using neutron interrogation. J Appl Phys, 2010, 108: 111101–1
Slaughter D, Accatino M, Bernstein A, et al. Securing special nuclear material: Recent advances in neutron detection and their role in nonproliferation. UCRL-ID-155315, Lawrence Livermore National Laboratory, Livermore, CA, August 2003
Mascarenhas N, Brennan J, Krenz K, et al. Development of a neutron scatter camera for fission neutrons. IEEE NSS/MIC, San Diego, CA, 2006, N11-1: 185–188
Marleau P, Brennan P, Krenz K, et al. Advances in imaging fission neutrons with a neutron scatter camera. IEEE NSS/MIC, Honolulu, HI, 2007, N10-2: 170–172
Mascarenhas N, Brennan J, Krenz K, et al. Results with the neutron scatter camera. IEEE T Nucl Sci, 2009, 56: 1269–1273
Brennan J, Brubaker E, Cooper R, et al. Measurement of the fast neutron energy spectrum of an 241Am-Be source using a neutron scatter camera. IEEE T Nucl Sci, 2011, 58: 2426–2430
Macri J R, Bravar U, Legere J S, et al. The fast neutron imaging telescope (FNIT)-hardware development and prototype testing. IEEE NSS/MIC, 2007, N10-3: 173–178
Bravar U, Woolf R S, Bruillard P J, et al. Calibration of the fast neutron imaging telescope (FNIT) prototype detector. IEEE T Nucl Sci, 2009, 56: 2947–2954
Xu D. Gamma-ray Imaging and polarization measurement using 3-D position-sensitive CdZnTe detectors. Dissertation of Doctor Degree. Michigan: The University of Michigan, 2006
Wilderman S J, Fessler J A, Clinthorne N H, et al. Improved modeling of system response in list mode em reconstruction of compton scatter camera images. IEEE T Nucl Sci, 2001, 48: 111–116
Barrett H H, White T, Parra L C. List-mode likelihood. J Opt Soc Am A, 1997, 14: 2914–2923
Mesytec Inc. Detector electronics & readout system. http://www. mesytec.com
Ruben A, Hoagland T E, Fox R, et al. A new four channel pulse shape discriminator. IEEE NSS/MIC, 2007, N15-273: 681–684
Sparrow Inc.. Kmax program. http://www.sparrowcorp.com/
Pelowitz D B. MCNPX User’s Manual, Version 2.5.0. Los Alamos National Laboratory report LA-CP-05-0369 (April 2005) H-3, 2005
Zhang M, Peng B D, Sheng L, et al. Research of the system response of neutron double scatter imaging for MLEM reconstruction. Nucl Instrum Meth A, 2015, 775: 131–138
Reuss P. Neutron Physics. France: EDP Sciences, 2008. 203
Knoll G F. Radiation Detection and Measurement. 4th ed. New York: Wiley Press, 2000. 50
Dietze G, Klein H. Report PTB-ND-22. Braunschweig, Germany: Physikalisch-Techniche Bundesantalt, 1982
Matei C, Hambsch F J, Oberstedt S. Proton light output function and neutron efficiency of a p-terphenyl detector using a 252Cf source. Nucl Instrum Meth A, 2012, 676: 135–139
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zhang, X., Zhang, M., Sheng, L. et al. Image reconstruction of a neutron scatter camera. Sci. China Technol. Sci. 59, 149–155 (2016). https://doi.org/10.1007/s11431-015-5922-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11431-015-5922-0