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Proceedings Paper

a-Si:H/CsI(Tl) x-ray survey monitor working in photovoltaic mode
Author(s): Claudio Manfredotti; F. Fizzotti; E. Sacchi; Ettore Vittone; M. Boero; U. Nastasi
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Paper Abstract

A study concerning the use of a 1 cm2 p-i-n (alpha) -Si:H structure coupled to a 1 cm3 CsI(Tl) scintillator is presented and discussed as a survey meter in the range from 20 to 125 keV x ray peak energy. A particular mesa etch, coupled with standard photolithography, lowers dark current in the pA region, allowing the use of the detector in the photovoltaic mode. In this work, we describe the details of detector fabrication, the various steps of detector simulation in order to look for detector performance improvements, and the different stages of detector testing in the reported energy range. For each energy, the linearity of the detector response as a function of the dose rate has been accurately measured and compared with standard ionization chambers of different volumes. Finally, the effective energy reconstruction and the instrument calibration is presented and discussed. Wearing-on applications, similar to film badges, are envisaged and possible solutions are introduced and discussed.

Paper Details

Date Published: 12 July 1994
PDF: 8 pages
Proc. SPIE 2278, X-Ray and UV Detectors, (12 July 1994); doi: 10.1117/12.179998
Show Author Affiliations
Claudio Manfredotti, Univ. of Torino (Italy)
F. Fizzotti, Univ. of Torino (Italy)
E. Sacchi, Univ. of Torino (Italy)
Ettore Vittone, Univ. of Torino (Italy)
M. Boero, Univ. of Torino and INFN-Sez. Torino (Italy)
U. Nastasi, Ospedale S. Giovanni Battista (Italy)

Published in SPIE Proceedings Vol. 2278:
X-Ray and UV Detectors
Richard B. Hoover; Mark W. Tate, Editor(s)

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