Our team at UMD has been involved with the creation and background modeling of a radiation shield for the miniTimeCube (mTC), a small plastic scintillator antineutrino detector currently undergoing testing at the NIST Center for Neutron Research (NCNR) at the National Institute of Standards and Technology (NIST). We employed SoftWare for Optimization of Radiation Detectors (SWORD), a Naval Research Lab (NRL) software which uses GEANT4. We simulated the background signal within the shielding, including cosmically produced muons, neutrons, and gammas and reactor produced neutrons and gammas.
The shielding weights ~ 20 tons and is ~2 m on a side. The shield is composed of an outer and inner layer of 5% borated-polyethylene with a layer of mixed steel shot and parrafin wax between.
CAD drawing showing mTC (small cube) within the radiation shielding. The two green hexagons represent the reactor core.
(Figure 9 from Li et al., 2016)
Simulation of the mTC located within the shielding (smallest square), all of which is in front of the reactor bio-shield.
mTC (small yellow cube) within layers of shielding (mainly iron and borated-polyethylene).
Li, V.A., Dorril, R., Duvall, M.J, Koblanski, J., Negrashov, S., Sakai, M., Wipperfurth, S.A., Engel, K., Jocher, G.R., Learned, J.G., Macchiarulo, L., Matsuno, S., McDonough, W.F., Mumm, H.P., Murillo, J., Nishimura, K., Rosen, M., Usman, S.M., Varner, G.S., 2016, Invited Article: miniTimeCube: AIP Review of Scientific Instruments, submitted. doi: 10.1063/1.4942243
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Updated: September 2017