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27 August 2015 Design and optimization of a radiation detector for ground and spaced-based exposure
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Abstract
In response to the critical need of more effective bio-dosimetric techniques to improve cancer risk estimation, this paper focuses on the design of an advanced biomedical instrumentation that could be used for radiation risk analysis on space missions. A designed concept for a hodoscope for radiation detection and tracking is tested via Monte Carlo simulation. The device consists of a set of layers of scintillating fibers, above and below a biological sample, in a design that allows for the determination of the direction of incoming and outgoing radiation. The efficiency of energy deposition on each of the different layers of the device is studied for proton radiation. The study of the response for different incoming energy is the main focus, but fiber-size is also a designed parameter considered in this study. The optimum energy range as found to be around 30 MeV’s – 50MeV’s depending on arrangement. It is found that energy deposited by protons in the optimum range in 1 mm-diameter fibers, is large enough for detection. Since smaller fibers allow for larger resolution, it is concluded that they are preferable than 2 mm fibers. Alternative arrangements consisting respectively of 3 and 4 layers of fibers on each side of the sample are tested and compared. It is observed that although one more coordinate for the source is needed, the 3-layers array is a viable alternative when that extra information is available. With this arrangement, the device is sensitive to lower energy photons.
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Dileon Saint-Jean, Kazim Abbot, Darnel Williams, Dilip Jana, Lee Sawyer, and Pedro Derosa "Design and optimization of a radiation detector for ground and spaced-based exposure", Proc. SPIE 9595, Radiation Detectors: Systems and Applications XVI, 959508 (27 August 2015); https://doi.org/10.1117/12.2191864
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