Very large area multi-element microstructured semiconductor neutron detector panel array

Abstract

Low-power microstructured semiconductor neutron detector (MSND) devices have long been investigated as a high-efficiency replacement for thin-film diodes for solid-state thermal neutron detection. Improvements in detection efficiency were made by integrating two stacked 1 cm2 devices to function as a single detector, achieving over 42% intrinsic thermal neutron detection efficiency. The need for larger active area devices led to the development of the Arrayed Device which combined seventy-two dual-stacked 1 cm2 devices to act as a single large-area detector in a 6×6 configuration, providing an active detector area of 36 cm2. A new development in large active area devices has led to high-quality 4 cm2 individual devices arrayed into a detector array comprised of 16 of individual perforated devices, at 64 cm2, providing a 78% increase in active area over the previously reported 6×6 element. Nine of the 4×4 4-cm2 elements are then integrated together into the Very Large Area Panel Array (VLAPA) with total device dimensions of 11.125×11.125×0.5 without moderator. The elements work to function as a single VLAPA with an effective active detection area of 576 cm2. The VLAP A has been found to have an intrinsic efficiency of 2.21±0.02% with 2 inches HDPE on the front and back for an unmoderated 252Cf source.