233U. Which is a neutron field weekly fissions. The US found a Pt 233U bomb was low yield.
Which makes it idea for power production. It gradually consume the Pt, but produces weaker radiation sources.
Problem, fast breeders use Pt produces and stored by U fission plants. Which require insurance of 100 billion – so are all globally prohibited today.
Only India and France permit fast breeder technology: the US and UK prohibit the use of Pt – the most toxic substance known to man.
If a terrorist group want to make a dirty bomb, they crash a light air craft filled with high explosive into a nuclear power plant.
The nuclear buys knew of this problem, but making a crash proof plant is prohibitively expensive. U fission plants are all under insured and illegal.
Thorium plants HAVE to contain Pt(No - see below) – so again must be bomb proof – making Th power uneconomic and dangerous: again Pt use is prohibited in most developed countries – included the US – the main target for Thorium power.
There is an answer, use a H plasma to generate neutrons. But a 50x1cm H plasma will produce 1.2 MW of heat, >288kW of mains power. From 5x10-14cc of regular water a year.
No radioactive waste. So cut out the Th, U and Pt: that is clear nuclear – a plasma burn.Plants take in extra CO2, to increase life on Earth.
So there is a pre-industrial 2 parts per million CO2 in the air. A static trace gas affects nothing. The Fossil Fuels were active life in pre-history.