transuranic elements are all elements with atomic numbers greater than 92, uranium is 92 so transuranic is past uranium
Only plutonium! Is that any better?Actually all the transuranics can make suitable fuel for nuclear reactors, especially Americium. The Integral Fast Breeder(IFB) reactor was designed to reprocess Uranium and all the transuranics produced into fuel rods onsite, leaving only the short lived fission products as waste, which would only require storage for a couple centuries (not hundreds of thousands of years as current waste with the transuranics still in it does). Some of these fission products have industrial and/or medical uses and would be worth separating from the waste.
There has been no increase in the number of elements, it's just that people discovered ones that were unknown. The only exception is the use of nuclear reactions (in accelerators, reactors, and bombs) to create technetium, promethium, and the transuranics. But many of these except for extreme transuranics already existed on earth but at such small trace levels they were unknown until long after they had been artificially made and measured.
Uranium-235 when started. After running a while they also burn transuranics like Plutonium-239 and Americium-241.
some:The plutonium and other transuranics can be recycled. They make excellent reactor fuel.The unburned uranium can be recycled.Many of the fission products could be separated for industrial and medical uses.
Uranium-235 or Plutonium-239, or Uranium-233. Also many transuranics, like Americium make good fuel.
Of the 92 elements from hydrogen to uranium 90 of them are present in some amount in the crust of the earth. Trace amounts of plutonium and other transuranics are also present.
Uranium in either oxide or metallic form, depending on type of reactor. Plutonium and other transuranics also would be suitable fuel, but no full scale power reactors have been designed to make use of them.
If done properly it can be as safe or safer than other transportation, especially if the plutonium and other transuranics have already been recycled to new fuel. But this is likely to get censored as many anti-nuclear people don't want it known.
all reactor waste products with lifetimes over a few hundred years make excellent reactor fuel, they should all be recycled and reused in reactors. these are all transuranics, not fission products.
I am sorry, but the number of elements in the mantle is far more than just 4, in fact it probably contains in various amounts 90 of the 92 elements from hydrogen to uranium and very tiny trace quantities of some transuranics like plutonium.
A nuclear reactor is usually fueled with Uranium oxide, normally known as yellowcake because it is yellow. Some reactors are fueled with MOX, Mixed OXide fuel containing both Uranium and Plutonium oxides. After a reactor has run a few months it has breed several transuranics including Plutonium, Americium, and Curium (yes, all reactors breed transuranics, many of which are usable fuels, not just breeder reactors) which it begins to burn too.So I have no idea what you mean by "two substances", all reactors within a few months of startup are burning almost every element from Uranium through the highest transuranic element they can breed (which depends on neutron flux and energy spectrum) regardless of what they were fueled with originally.
Long half life (20,000 years and up) most of these are transuranics and make excellent reactor fuel if separated, they should not be considered wastes if handled properly.Short half life (200 years and down) many of these have industrial or medical uses. Proper separation would eliminate those from the waste too, leaving much less waste volume to deal with.