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An estimated 26 million people in low- and middle-income countries are atrisk of lead exposure and there is no safe threshold for lead ingestion. Radioassay methods are not easily accessible in regions at risk, therefore a lowcost and easy to use sensor is desirable. $\textrm{Pb}$ occurs together withtraces of radioisotopes with decay energies in the range of $10$ to several\SI{100}{\kilo\electronvolt} and beyond. Such energies are accessible insilicon sensors. We have tested a scientific CMOS (Neo 5.5 sCMOS), optimisedfor optical wavelengths, as $\gamma$ detector for radiation in the range of $0$to a few 10 keV. We find a minimal detectable $^{241}\textrm{Am}$ decay rate of20 Bq for a < 1.4h measurement. Optimising our analysis software willpotentially enable detecting lower rates in the same measurement time. Weestablished that the Neo 5.5 sCMOS allows to measure a spectrum of$^{241}\textrm{Am}$ decay lines. In addition we show that it is possible toenhance the concentration of radioisotopes in water when reducing the water'svolume by boiling. The knowledge gained using the scientific CMOS sensor willbe transferred to commercial silicon sensors as the chips in smart phones.

Towards a low cost lead assay technique for drinking water using CMOS sensors