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californium 252 is a radioactive isotope with a half life of 2.6 years. It can also be written as ²⁵²Cf. It is a neutron source that produces 170 000 000 per minute!

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californium 252 identifies the presence of silver and gold ores through the method of neutron activation . Due to the fact that it is a very efficient source of neutron activation - californium 252 is used in the oil industry. Californium can be used in devices called neutron moisture gauges that find oil-and water-bearing layers within the wells.

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Californium 252's  neutron sources are used in nuclear reactors, which produce nuclear fission. The neutrons also help in starting chain reactions which makes a nuclear reactor function smoothly

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Californium 252 may be useful, but it is also VERY expensive. 1 gram of californium 252 costs $27 000 000. Californium 252 was made artificially and so it is very rare, and not found in nature . Californium 252 is also highly radioactive, therefore it is harmful. The radiation passes through many food chains, effecting animals, plants, and humans. It also effects the gene pool of humans, and all living species, causing cancer, immune system damage, leukemia, deformities and fertility problems etc.

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Californium 252 is also used for cancer therapy, and other medical aspects. When it is injected into the body, it is deposited in the bones. The radiation helps determine the heath of the bones.

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Californium 252 is also used in airline baggage checks because it is a fast and efficient way to scan bags without having to open them. This is because of the radiation.

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Californium 252 can also help in checking the moisture level in soil, which is very important for building roads and construction of buildings.

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Californium 252 has many uses, in many industries which boosts economic growth and makes work faster and efficient. Some industries include- medical, security, nuclear science, jewelry, environmental etc.

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Californium 252 is also used to track the sulfur content in petroleum and diesel which is important to the oil industry.

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http://www.chemistryexplained.com/elements/A-C/Californium.html
https://www.lenntech.com/periodic/elements/cf.htm
https://www.chemicool.com/elements/californium.html