The new part is that it's using Americium. That's it. It's a challenge to use the material for various reasons but the wonderful thing about it is that it's eas

The new part is that it's using Americium. That's it. It's a challenge to use the material for various reasons but the wonderful thing about it is that it's easier to get hold of apparently. The UK, in fact, has a problem with its plutonium stockpiles being polluted increasingly by Americium and now there's something it can be used for. There are significant disadvantages (lower power per weight, high gamma ray activity) and some upsides (longer half-life by a big factor).