MCNPX simulation for α-particle detection by CMOS active pixel sensor

This work assesses the performance of the CMOS electronic system for α-particle detection from sources and in a 222Rn atmosphere and compares the experimental results with those obtained from conventional methods. For the measurements, a special acquisition system with a digital mother board and a daughter board supporting the chip was developed. First measurements were reproduced with a simulation using the MCNPX (Monte Carlo N-Particles) code.