Dosimetry and calorimetry performance of a scientific CMOS camera for environmental monitoring

• DOI: 10.48550/arxiv.2009.11227
• Publication Date: 2020-01-01
• Authors: A. A. Aguilar-Are...; X. Bertou; Carles Canet; Miguel Á. Cruz-Pérez; A. Deisting; Adriana B. C. Dias; Juan Carlos D’Olivo; F. Favela-Pérez; E. A. Garcés; Adiv González Muñoz; Jaime Octavio Gue...; Javier Mancera-Al...; D. J. Marı́n-Lámb...; Mauricio Martinez...; J. Monroe; S.M. Paling; S. J. M. Peeters; Paul Scovell; C. Türkoğlu; E. Vázquez-Jáuregui; J. Walding
• Keywords: CMOS Sensor; Calorimeter (particle physics)

This paper explores the prospect of CMOS devices to assay lead in drinking water, using calorimetry. Lead occurs together with traces radioisotopes, e.g. Lead-210, producing $\gamma$-emissions energies ranging from 10 keV several 100 when they decay; this range is detectable silicon sensors. In we test a camera (Oxford Instruments Neo 5.5) for its general performance as detector x-rays and low energy $\gamma$-rays assess sensitivity relative World Health Organization upper limit on water. Energies 6 60 are examined. The has linear response over resolution most part slightly better than 2 %. sCMOS not sensitive below $\sim\!\!10 keV$. smallest rate 40$\pm$3 mHz, corresponding an incident activity chip 7$\pm$4 Bq. estimation detected relies geometric acceptance measured efficiency vs. energy. We report measurement, which 0.08$\pm$0.02 % (0.0011$\pm$0.0002 %) at 26.3 (59.5 keV). Taking calorimetric information into account measure minimal 4$\pm$1 mHz (1.5$\pm$0.1 mHz) keV) $\gamma$-rays, corresponds 1.0$\pm$0.6 Bq (57$\pm$33 Bq). Toy Monte Carlo Geant4 simulations agree these results. These results show sensor well-suited $\gamma$- x-ray few ppb level Lead-210 sample.