Discrete analog electronics for high-resistivity silicon detectors used for X-ray and γ-ray spectroscopy in whole-body monitoring

The work is aimed at developing an in vivo spectroscopy system for radiation protection monitoring to improve the lung detection of 239Pu and 241Am. Silicon components have been investigated for high-resolution spectroscopy (2 keV) at room temperature to measure 59.5 keV 241Am gamma rays. The requirements and constraints of such device are reviewed. The work is focused on analog electronics and detector development. As a first step, multi-channel electronic circuits based on a low-noise charge-sensitive preamplifier have been built by carrying the FETs and feedback capacitances close to the strips. The performance is presented for a large-area strip silicon detector (3 × 3 cm2). Measurements are compared with simulations and discussed with respect to application requirements.