Browsing by Author "Uher, J"

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    From imaging to dosimetry: GEANT4-based study on the application of medipix to neutron dosimetry
    (Elsevier, 2009-10-12) Othman, MAR; Marinaro, DG; Petasecca, M; Guatelli, S; Cutajar, DL; Lerch, MLF; Prokopovich, DA; Reinhard, MI; Uher, J; Jakubek, J; Pospisil, S; Rosenfeld, AB
    An application of Medipix2 using a newly developed segmented multiple thickness polyethylene (PE) converter for fast neutron detection is presented. The system has the ability to provide an energy independent response for the dose equivalent for fast neutrons. The application of weighting factors to each defined thickness of PE allows for a flattening of the response of the detector system for dosimetry applications. Six PE converter segments were applied, and their thicknesses and weighting factors were optimised to obtain the required energy independent detector response. The study performed by means of GEANT4. Its suitability for neutron dosimetry was studied with respect to a previously published work. © 2013 Elsevier B.V.
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    Neutron dosimeter development based on Medipix2
    (Institute of Electrical and Electronics Engineers (IEEE), 2010-12) Othman, MAR; Petasecca, M; Guatelli, S; Uher, J; Marinaro, DG; Prokopovich, DA; Reinhard, MI; Lerch, MLF; Jakubek, J; Pospisil, S; Rosenfeld, AB
    A novel neutron dosimetry system for avionics and space applications is described. The new dosimetric system is based on Medipix2, a high density silicon based pixilated detector with integrated readout and digital interface circuitry. Real time dose equivalent response to fast neutron fields with flattened energy response is achieved through the coupling of a structured variable thickness polyethylene (PE) over layer with the high density pixilated detector. Experimental results obtained to 14 MeV D-T and Am-Be neutron fields are described along with a comparison to results obtained with GEANT4 simulations. © 2010, Institute of Electrical and Electronics Engineers (IEEE)