This looks like a big improvement over the current state-of-the-art. https://en.wikipedia.org/wiki/Betavoltaic_device https://en.wikipedia.org/wiki/Betavoltaic

This looks like a big improvement over the current state-of-the-art. https://en.wikipedia.org/wiki/Betavoltaic_device https://en.wikipedia.org/wiki/Betavoltaic_device