Demonstrating the of a CMOS pixel detector for a future neutron dosimeter

Design of a monolithic CMOS sensor for high efficiency neutron counting

“…According to our previous study, a threshold of 28 000 electrons (100 keV) will lead to an efficiency ratio of 0.9 together with a high signal purity of 99% (n=g ratio) [4]. The device simulations indicated that the charge collection efficiency of the 4 Â 4 diode cluster (with diode size of 5 Â 5 mm 2 , inter-diode distance of 80 mm) is around 60% [9].…”

“…The results have demonstrated that CMOS sensor allows good g discrimination with a satisfactory measured efficiency of more than 10 À3 for both of fast neutrons [4] and thermal neutrons [6]. The study with the MIMOSA5 indicated that CMOS sensor is a promising candidate for neutron dosimetry, on the other hand, the pixellization of the sensing elements results in a stringent constraint on the low activity sources.…”

“…We propose a solution based on CMOS sensors, which integrate the sensing element and the processing electronics on the same silicon substrate. Because of the thin sensitive volume ( $ 10220 mm), these sensors have low sensitivity to gamma radiation [4], which is a particularly attractive feature for neutron monitoring. Moreover, the thin sensitive layer allows thinning CMOS sensors down to about 50 mm or even less without affecting the signal generation [5].…”