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A High-Sensitivity Low-Power CMOS Sensor for a Future Neutron Personal Dosimeter

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6 Author(s)
Zhang, Y. ; Institut Pluridisciplinaire Hubert Curien (IPHC), University of Strasbourg, CNRS/IN2P3, Strasbourg, France ; Hu-Guo, C. ; Husson, D. ; Le, T.-D.
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Despite a continuously increasing demand, neutron electronic personal dosimeters (EPDs) are still far from being completely established. A high sensitivity, low power consumption CMOS sensor for a future neutron personal dosimeter has been implemented in a 0.35 $mu$m CMOS technology. The 2.56 $,times,$2.56 mm$^{2}$ sensing part is a micro-diode system of very low capacitance, implemented on the same substrate than the readout electronics. The excess electrons generated by an impinging particle are collected by the micro-diodes through thermal diffusion. The charge collection time and efficiency are the crucial points of a CMOS detector. We performed 3-D device simulations, using the commercially available Synopsys-SENTAURUS package, to address the detailed charge collection process. A charge sensitive amplifier (CSA) and a shaper are employed in the front-end readout. In this paper, the first electrical tests and $alpha$-measurements are presented.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:59 ,  Issue: 4 )

Date of Publication:

Aug. 2012

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