High Precision Integrator for CVD-Diamond Detectors for Dosimetric Applications

CVD-diamond represents a well-known solid state material also used for the fabrication of dosimeters applied in radiotherapy. In this field, sensitive electronics as electrometers are commonly used for signal acquisition, mainly due to a relatively low amplitude of the photocurrent produced by the dosimeter. In this paper, a compact and portable equipment able to measure currents down to the pA range is illustrated. Experimental results highlight excellent performance in terms of linearity and sensitivity in the wide investigated range (pA - nA). In addition, an in-system self-calibration mechanism is proposed to guarantee a very good system accuracy without any increase of the circuit complexity.