Where can thorium 232 be found?

Thorium is mainly mined in Australia, Canada, the United States, Russia and India, according to Minerals Education Coalition. Trace levels of thorium are found in rocks, soil, water, plants and animals, according to the U.S. Environmental Protection Agency (EPA).

What is the difference between U 235 and U 238?

U-235 is the main fissile isotope of uranium. The nucleus of the U-235 atom contains 92 protons and 143 neutrons, giving an atomic mass of 235 units. The U-238 nucleus also has 92 protons but has 146 neutrons – three more than U-235 – and therefore has a mass of 238 units.

How expensive is thorium?

The salts cost roughly $150/kg, and thorium costs about $30/kg. If thorium becomes popular, this cost will only decrease as thorium is widely available anywhere in the earth’s crust. Thorium is found in a concentration over 500 times greater than fissile uranium-235.

Which is more radioactive U 235 or U-238?

Though uranium is highly associated with radioactivity, its rate of decay is so low that this element is actually not one of the more radioactive ones out there. Uranium-238 has a half-life of an incredible 4.5 billion years. Uranium-235 has a half-life of just over 700 million years.

Does U-238 fission easily?

The much more abundant uranium-238 does not undergo fission and therefore cannot be used as a fuel for nuclear reactors. However, if uranium-238 is bombarded with neutrons (from uranium-235, for example), it absorbs a neutron and is transformed into uranium-239.

Why is Th-232 used for thorium fuel?

All thorium fuel concepts therefore require that Th-232 is first irradiated in a reactor to provide the necessary neutron dosing to produce protactinium-233.

Is it possible to breed thorium fuel?

It is possible – but quite difficult – to design thorium fuels that produce more U-233 in thermal reactors than the fissile material they consume (this is referred to as having a fissile conversion ratio of more than 1.0 and is also called breeding).

Can thorium be used as a fuel in a nuclear reactor?

Thorium as a nuclear fuel. Thorium (Th-232) is not itself fissile and so is not directly usable in a thermal neutron reactor. However, it is ‘fertile’ and upon absorbing a neutron will transmute to uranium-233 (U-233) a, which is an excellent fissile fuel material b. In this regard it is similar to uranium-238 (which transmutes to plutonium-239).

What is the difference between uranium and thorium?

Thorium is more abundant in nature than uranium. It is fertile rather than fissile, and can only be used as a fuel in conjunction with a fissile material such as recycled plutonium.

https://www.youtube.com/watch?v=dwRt74nzRmY