"Can it detect the radiation inside a lead box?"
Lead is transparent to certain types of radiation emissions. That's why it's used as coolant in certain types of nuclear reactors:
https://www.gen-4.org/gif/jcms/c_42149/lead-cooled-fast-reactor-lfr
"Can it detect the radiation inside a lead box?"
Lead is transparent to certain types of radiation emissions. That's why it's used as coolant in certain types of nuclear reactors:
https://www.gen-4.org/gif/jcms/c_42149/lead-cooled-fast-reactor-lfr