Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 57, Number 11
Friday–Saturday, October 26–27, 2012; Socorro, New Mexico
Session J4: Nuclear Physics II |
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Chair: Nevzat Guler, Los Alamos National Laboratory Room: Macey Center Agora |
Saturday, October 27, 2012 1:30PM - 1:54PM |
J4.00001: Surface Mounted Neutron Generators Invited Speaker: Juan M. Elizondo-Decanini A deuterium-tritium (DT) base reaction pulsed neutron generator packaged in a flat computer chip shape of 1.54 cm (0.600 in) wide by 3.175 cm (1.25 in) length and 0.3 cm (0.120 in) thick has been successfully demonstrated to produce 14 MeV neutrons at a rate of 10$^{9}$ neutrons per second. The neutron generator is based on a deuterium ion beam accelerated to impact a tritium loaded target. The accelerating voltage is in the 15 to 20 kV in a 3 mm (0.120 in) gap, the ion beam is shaped by using a lens design to produce a flat ion beam that conforms to the flat rectangular target. The ion source is a simple surface mounted deuterium filled titanium film with a fused gap that operates at a current-voltage design to release the deuterium during a pulse length of about 1 $\mu $s. We present the general description of the working prototypes, which we have labeled the ``NEUTRISTOR.''\\[4pt] Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration. Work funded by the LDRD office. [Preview Abstract] |
Saturday, October 27, 2012 1:54PM - 2:06PM |
J4.00002: Analysis of Cadmium Based Neutron Detector Configurations Brian James, Lawrence Rees, J. Bart Czirr Due to national security concerns pertaining to the smuggling of special nuclear materials and a small supply of He-3 for use in neutron detectors, there is currently a need for a new kind of neutron detector. Using Monte Carlo techniques I have studied the neutron capture efficiency of an array of cadmium wedge detectors in the presence of a californium source. By using varying numbers of wedges and comparing their capture ratios we will be better able to design future detectors. [Preview Abstract] |
Saturday, October 27, 2012 2:06PM - 2:18PM |
J4.00003: A Neutron Detector Constructed Using Shards of $^{6}$Li-loaded Glass Scintillator Steven Gardiner, Bart Czirr, Lawrence Rees Because of a global shortage of $^{3}$He, an essential component of many neutron detectors, much work is currently being done to develop new neutron detectors based on alternative materials for homeland security applications. One of the possible replacements for $^{3}$He is Ce$^{3+}$-activated, $^{6}$Li-loaded glass scintillator. Although this material has been widely used in neutron detectors for over half a century, its relatively high gamma sensitivity has made it unattractive for use in radiation portal monitors. We have tested a new technique for reducing the gamma sensitivity of a neutron detector based on $^{6}$Li glass. Our prototype neutron detector consists of small (about 1 mm$^3$) shards of $^{6}$Li-loaded glass scintillator embedded in optical epoxy. Mineral oil is placed behind the glass and epoxy for moderation. Our tests indicate that this detector can achieve a gamma sensitivity that is at least 100 times lower than a comparable neutron detector constructed using a thin sheet of $^{6}$Li glass. Modeling performed using the particle transport codes MCNP and PENELOPE suggests that the gamma sensitivity of the glass shards is lower because more high-energy Compton electrons escape them before depositing their full energy. [Preview Abstract] |
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