ANSTO Publications Online >
Journal Publications >
Journal Articles >

Please use this identifier to cite or link to this item:

Title: Evaluation of silicon detectors with integrated JFET for biomedical applications.
Authors: Safavi-Naeini, M
Franklin, DR
Lerch, MLF
Petasecca, M
Pignatel, G
Reinhard, MI
Dalla Betta, GF
Zorzi, N
Rosenfeld, AB
Keywords: Silicon
Gamma Cameras
Charge States
Issue Date: Jun-2009
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Citation: Safavi-Naeini, M., Franklin, D. R., Lerch, M. L. F., Petasecca, M., Pignatel, G. U., Reinhard, M., et al. (2009). Evaluation of silicon detectors with integrated JFET for biomedical applications. IEEE Transactions on Nuclear Science, 56(3), 1051-1055.
Abstract: This paper presents initial results from electrical, spectroscopic and ion beam induced charge (IBIC) characterisation of a novel silicon PIN detector, featuring an on-chip n -channel JFET and matched feedback capacitor integrated on its p-side (frontside). This structure reduces electronic noise by minimising stray capacitance and enables highly efficient optical coupling between the detector back-side and scintillator, providing a fill factor of close to 100%. The detector is specifically designed for use in high resolution gamma cameras, where a pixellated scintillator crystal is directly coupled to an array of silicon photodetectors. The on-chip JFET is matched with the photodiode capacitance and forms the input stage of an external charge sensitive preamplifier (CSA). The integrated monolithic feedback capacitor eliminates the need for an external feedback capacitor in the external electronic readout circuit, improving the system performance by eliminating uncontrolled parasitic capacitances. An optimised noise figure of 152 electrons RMS was obtained with a shaping time of 2 mus and a total detector capacitance of 2 pF. The energy resolution obtained at room temperature (2°C) at 27 keV (direct interaction of I-125 gamma rays) was 5.09%, measured at full width at half maximum (FWHM). The effectiveness of the guard ring in minimising the detector leakage current and its influence on the total charge collection volume is clearly demonstrated by the IBIC images. © 2009, Institute of Electrical and Electronics Engineers (IEEE)
ISSN: 0018-9499
Appears in Collections:Journal Articles

Files in This Item:

There are no files associated with this item.

Items in APO are protected by copyright, with all rights reserved, unless otherwise indicated.


Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback