We have investigated the efficiency and the noise occupancy of a double-sided silicon strip detector, which was subjected to non-uniform proton irradiations up to a maximum equivalent fluence of 5 . 1013p . ~m -~. The depletion voltage, varying over time due to controlled annealing, was close to zero on one end of the 6cm strips and 19OV at the high radiation end. We have determined the efficiency and noise occupancy on both n-side and p-side in a lo6Ru telescope, using a binary read-out system with 22ns shaping time.The n-side exhibits superior performance after type inversion.
The Los Alamos Neutron Science Center (LANSCE) operates two spallation neutron sources dedicated to research in materials science, condensed-matter physics, and fundamental and applied nuclear physics. Prior to 1995, all thermal neutron radiography at Los Alamos was done on a beam port attached to the Omega West reactor, a small 8 MW research reactor used primarily for radioisotope production and prompt and delayed neutron activation analysis. After the closure of this facility, two largely independent radiography development efforts were begun at LANSCE using moderated cold and thermal neutrons from the Target-1 source and high-energy neutrons from the Target-4 source. Investigations with cold and thermal neutrons employed a neutron converter and film, a scintillation screen and CCD camera system, and a new high-resolution amorphous silicon (a-Si) flat-panel detector system. Recent work with high energy neutrons (E n > 1 MeV) has involved storage-phosphor image plates. Some comparison high-energy images were obtained with both image plates and the aSi panel and showed equivalent image quality for approximately equal exposure times.
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