Selenium-75

Selenium-75 is a radioisotope of the chemical element selenium. It is a gamma emitter with a half-life of 119.8 days. Selenium-75 is commonly used in industrial radiography, particularly in the inspection of welds and castings.

Production

Selenium-75 is produced by the neutron irradiation of selenium-74 in a nuclear reactor. The selenium-74 absorbs a neutron to become selenium-75, which is then extracted and purified.

Uses

The primary use of selenium-75 is in industrial radiography. Its gamma radiation is used to inspect materials for internal defects, such as cracks or voids. This is particularly useful in the inspection of welds and castings, where defects can lead to failure of the component.

Selenium-75 is also used in radiation therapy for the treatment of certain types of cancer. Its gamma radiation can be targeted at the cancer cells, killing them and preventing their growth.

Safety

As a radioactive material, selenium-75 must be handled with care to prevent exposure to its gamma radiation. This includes the use of shielding and personal protective equipment, as well as following safe handling procedures.

Disposal

Disposal of selenium-75 must be done in accordance with regulations for radioactive waste. This typically involves storing the material until it has decayed to a safe level, and then disposing of it in a licensed facility.

See also

• Industrial radiography
• Radiation therapy
• Radioactive waste

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