Just because it is a long-lived radioactive isotope does not mean it is dangerous. I'm referring to U238. It decays by alpha radiation, so unless you are literally eating it or inhaling it, those alpha particles will not penetrate your skin. Additionally, U238's long half life is why it remains as the most plentiful naturally occurring (on Earth) radioactive isotope. I'm tired of people trying to fear-monger radiation by throwing big numbers around. It would be instead be helpful discussing how to get roughly 4 alpha particles to decay per day inside them someone needs to eat roughly 1,000,000,000,000g of pure U238 that day.