A detail worth mentioning is that the U233 produced in the Thorium cycle is mixed with U232 which is higly gamma radioactive, it's still Uranium, not another el

A detail worth mentioning is that the U233 produced in the Thorium cycle is mixed with U232 which is higly gamma radioactive, it's still Uranium, not another element, which means beast of luck separating it U233 from in the mix. You'd have to wait quite a bit for it to decay to Pa232 before you an chemically separated it. That's why the Thorium cycle is touted as being proliferation resistant. It's not, but it's makes it harder and more expensive to build nuclear weapons.