> True but they might not know what it is. With a half life of 87.7 years there won't be any left by the time it's found. They'll have to know nuclear science

> True but they might not know what it is. With a half life of 87.7 years there won't be any left by the time it's found. They'll have to know nuclear science to even propose a hypothesis about what was in that container. If they don't then they'll scratch their heads about how this thing was even powered. The nature of unstable (and therefore radioactive) elements is that they'll decay until they are stable elements.