Browsing by Author "Lai, NS"

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    2nd generation microdosimeter with guard ring: an IBC study
    (Australian Institute of Nuclear Science and Engineering (AINSE), 2009-11-25) Ziebell, AL; Hu, N; Lai, NS; Lim, WH; Reinhard, MI; Prokopovich, DA; Siegele, R; Dzurak, AS; Rosenfeld, AB
    Silicon-on-insulator (SOI) micro dosimeters have recently been used to successfully measure the radiobiological properties of mixed radiation fields typical of medical, space and radiation protection environments. These SOI devices consist of a 2D array of elongated parallelepiped diode structures. Charge collection studies have revealed that due to the electric field distribution within the planar SV, there are significant lateral charge diffusion effects which complicate charge collection and give rise to a less than ideal chord length variance. © 2009 AINSE
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    Development and fabrication of cylindrical silicon-on-insulator microdosimeter arrays.
    (Institute of Electrical and Electronics Engineers (IEEE), 2009-06) Lai, NS; Lim, WH; Ziebell, AL; Reinhard, MI; Rosenfeld, AB; Dzurak, AS
    Recent developments in the fabrication and simulation of prototype silicon-on-insulator (SOI) microdosimeter arrays are presented. A new planar array design has been proposed which has a number of advantages over the previous elongated parallelepiped and cylindrical mesa array designs. This novel planar array design, which incorporates a guard ring, is based upon 2500 planar cylindrically shaped p-i-n detectors and was fabricated via dopant diffusion and ion implantation. The dopant-diffused arrays were successfully fabricated and tested using 2 mum and 10-mum- thick SOI substrates. Technology computer-aided design modeling of the ion-implanted structure is presented which includes the electrostatic potential profile, showing possible avalanche signal multiplication around the n+ core of the microdosimeter. The alpha particle charge transient response was simulated to determine the charge collection in the sensitive region. © 2009, Institute of Electrical and Electronics Engineers (IEEE)