Well, U is 10x more common element than Sn. Not just sny U isotope is good for fuel. But you are not quite right. Thorium fuels can breed fissile uranium-233 to

Well, U is 10x more common element than Sn. Not just sny U isotope is good for fuel. But you are not quite right. Thorium fuels can breed fissile uranium-233 to be used in various kinds of nuclear reactors.