Publication: Simulation and First Test of a Microdosimetric Detector Based on a Thick Gas Electron Multiplier

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Title	Simulation and First Test of a Microdosimetric Detector Based on a Thick Gas Electron Multiplier
Authors/Editors*	S.H. Byun, G.M. Spirou, A. Hanu, W.V. Prestwich, A.J. Waker
Where published*	IEEE Trans. Nucl. Sci.
How published*	Journal
Year*	2009
Volume	56
Number	3
Pages	1108â1113
Publisher	IEEE
Keywords	Gas Electron Multiplier, Microdosimetry, Proportional Counter
Link	http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5076082&isnumber=5075924
Abstract	We present design of a new microdosimetry detector based on thick gas electron multiplier (THGEM). A prototype detector was designed for a cylindrical sensitive volume with 5 mm diameter and 5 mm height. To optimize the avalanche gain, the electron avalanche process was modeled by varying THGEM thickness, hole diameter and high voltage bias for the tissue-equivalent propane gas. For a THGEM with 0.6 mm thickness and 0.3 mm hole diameter, the theoretical avalanche gain reached ~ 200 at a 800 V THGEM bias. The prototype detector was fabricated and tested using the McMaster 7Li(p,n) neutron source. The avalanche gain of the prototype detector was comparable with the gain of the standard microdosimetry detector. Additional THGEMs with various thicknesses were fabricated and are under tests.