RTGs are only really useful with particular elements; plutonium is used because it emits a lot of heat for a very long time. People freak out about plutonium.

RTGs are only really useful with particular elements; plutonium is used because it emits a lot of heat for a very long time. People freak out about plutonium. I think these betavoltaic cells can use elements which are less likely to get people upset about proliferation or environmental effects. It's not the same thing at all, but I think you could compare these favorably with e.g. Americium in common smoke detectors (alpha decay). Edit: also your comment just said nuclear batteries and voyager, but these batteries are not anything like those batteries and should not be thought of as the same, regardless of politics.