Title :
Edge-on face-to-face MOSFET for synchrotron microbeam dosimetry: MC modeling
Author :
Rosenfeld, Anatoly B. ; Siegbahn, Erik A. ; Brauer-Krish, Elke ; Holmes-Siedle, Andrew ; Lerch, Michael L F ; Bravin, Alberto ; Cornelius, Iwan M. ; Takacs, George J. ; Painuly, Nirmal ; Nettelback, Heidi ; Kron, Tomas
Author_Institution :
Centre for Med. Radiat. Phys., Univ. of Wollongong, NSW, Australia
Abstract :
The dosimetry of X-ray microbeams using MOSFETs results in an asymmetrical beam profile due to a lack of lateral charged particle equilibrium. Monte Carlo simulations were carried out using PENELOPE and GEANT4 codes to study this effect and a MOSFET on a micropositioner was scanned in the microbeam. Based on the simulations a new method of microbeam dosimetry is proposed. The proposed edge-on face-to-face (EOFF) MOSFET detector, a die arrangement proposed here for the first time, should alleviate the asymmetry. Further improvement is possible by thinning the silicon body of the MOSFET.
Keywords :
MOSFET; Monte Carlo methods; X-ray detection; dosimetry; GEANT4 codes; MC modeling; Monte Carlo simulations; PENELOPE; charged particle equilibrium; dose enhancement effects; edge-on face-face MOSFET detector; micropositioner; radiotherapy; synchrotron X-ray microbeam dosimetry; Australia; Detectors; Dosimetry; Electrons; Face detection; MOSFET circuits; Silicon; Spatial resolution; Synchrotron radiation; Testing; Charged-particle equilibrium (CPE); MOSFET; dose enhancement effects (DEEs); dosimetry; microbeam; radiotherapy; synchrotron;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2005.860704
