Abstract-Radiation detection systems used for monitoring long term waste storage need to be compact, rugged, and have low or no power requirements. By using piezoelectric materials it may be possible to create a reliable self-powered radiation detection system. To determine the feasibility of this approach, the electrical signal response of the piezoelectric materials to radiation must be characterized. To do so, an experimental geometry has been designed and a neutron source has been chosen as described in this paper, which will be used to irradiate a uranium foil for producing fission fragments. These future experiments will be aimed at finding the threshold of exposure of lead zirconate titanate (PZT) plates needed to produce and electrical signal. Based on the proposed experimental geometry the thermal neutron beam-line at the Breazeale Reactor at The Pennsylvania State University will be used as the neutron source. The uranium foil and neutron source will be able to supply a maximum flux of 1.5e5 fission fragments/second*cm 2 to each of the PZT plates.
Single-layer and multilayer longitudinal media were evaluated for lOO-Mb/in.' recording at a &pin. flying height with a magnetoresistive head. It was found that the multilayer media produced transition jitter values that were at least 23% below comparable single-layer results. Timing margins, estimated from the measured jitter and asymmetry data, indicate that single-layer media may prove marginal for this application. Multilayer timing margins were projected to be 40%. Signal-to-noise ratio, resolution, and overwrite comparisons are also made for both types of media. The improvements demonstrated with the multilayer media are attributed to the reduced media noise associated with this type of structure. Increased Cr spacer layer thickness in the multilayer media was found to increase jitter and reduce the DTO density response.
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