Thorium is a naturally occurring, radioactive substance. In the environment, thorium exists in combination with other minerals, such as silica
. Small amounts of thorium are present in all rocks, soil, water, plants, and animals. Soil contains an average of about 6 parts of thorium per million parts of soil (6 ppm).
More than 99% of natural thorium exists in the form of thorium-232. It breaks down into two parts-a small part called "alpha" radiation and a large part called the decay product. The decay product is also not stable and continues to break down through a series of decay products until a stable product is formed. During these decay processes, radioactive substances are produced. These include radium
. These substances give off radiation, including alpha and beta particles, and gamma radiation.
Some rocks in underground mines contain thorium in a more concentrated form. After these rocks are mined, thorium is usually concentrated and changed into thorium dioxide or other chemical forms. After most of the thorium is removed, the rocks are called "depleted" ore or tailings.
Thorium is used to make ceramics, gas lantern mantles, and metals used in the aerospace industry and in nuclear
reactions. Thorium can also be used as a fuel for generating nuclear energy.
Thorium is a radioactive substance that occurs naturally in the environment. It has been shown to cause an increase in cancers
of the lung
, pancreas, and blood
exposed to high levels of it in the air. This chemical has been found in at least 16 of the 1,177 National Priorities List sites
identified by the Environmental Protection Agency
See a doctor if you have been harmed by this substance. In addition, it
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Source: Agency for Toxic Substances and Disease Registry
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- Thorium: Frequently Asked Questions