Plutonium 238 is renowned as the most controllable nuclear fuel for spontaneous fission, common element of RTGs and such. I’d certainly go with it
And yes, certainly the case should be tough - and there should be the ability to passively remove heat, especially when tea isn’t there (which is bad, but hey, let’s not increase the tragedy by having nuclear meltdown)
Plutonium 238 is renowned as the most controllable nuclear fuel for spontaneous fission, common element of RTGs and such. I’d certainly go with it
And yes, certainly the case should be tough - and there should be the ability to passively remove heat, especially when tea isn’t there (which is bad, but hey, let’s not increase the tragedy by having nuclear meltdown)