Couldn’t we have a lead box lined with these radiation to electricity converters with a small amount of radioactive material in the center, and have an energy generating device that would last for thousands or even millions of years? Imagine putting the sun in a box lined with solar cells, but on a much smaller scale.
Is there a reason this wouldn’t work?
The youtube channel @PlainlyDifficult has a whole playlist about “sources in the wild” that also covered this one and many other nuclear accidents and incidents.