Ionizing radiation effects on a 64-channel charge measurement ASIC designed in CMOS 0.35μm technology

Autor: Andrea Attili, G. Mazza, M. Donetti, S. Iliescu, J. Pardo, N. Givehchi, F. Bourhaleb, Roberto Cirio, G. Pittà, Cristiana Peroni, A. Pecka, A. La Rosa, Simona Giordanengo, M. A. Garella, F. Marchetto
Rok vydání: 2008
Předmět:
Zdroj: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 593:619-623
ISSN: 0168-9002
DOI: 10.1016/j.nima.2008.05.037
Popis: A 64-channel circuit Application Specific Integrated Circuit (ASIC) for charge measurement has been designed in CMOS 0.35mm technology and characterized with electrical tests. The ASIC has been conceived to be used as a front-end for dosimetry and beam monitoring detector read-out. For that application, the circuitry is housed at a few centimeters from the irradiated area of the detectors and therefore radiation damages can affect the chip performances. The ASIC has been tested on an X-ray beam. In this paper, the results of the test and an estimate of the expected lifetime of the ASIC in a standard radio-therapeutical treatment environment are presented. An increase of the background current of 2 fA/Gy has been observed at low doses, whilst the gain changes by less than 3% when irradiated up to 15 kGy. Furthermore it has been assessed that, when used as an on-line beam monitor and the annealing effect has been taken into account, the background current increase is � 440 fA/year.
Databáze: OpenAIRE
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