Activated carbon filtration is commonly used to remove groundwater contaminants in water utilities. During its use. also groundwater radon is adsorbed on activated carbon where it radioactively decays to Pb-210 within a few days. The intermediate stages of radioactive decay produce gamma radiation outside the filter. https://safeersappliancers.shop/product-category/siemens-et651he17e-59cm-4-burners-ceramic-hob-electronic-display-touch-control/