Iodine-125

Iodine-125 (symbol I, atomic number 53) is a radioactive isotope of iodine, which has uses in biology, chemistry, and medicine. It is one of the many isotopes of iodine that are known, and it is particularly notable for its half-life of 59.4 days and its ability to emit gamma rays.

Production

Iodine-125 is produced in a nuclear reactor by the neutron irradiation of Xenon-124. This process involves the absorption of a neutron by the Xenon-124 nucleus, which then undergoes a beta decay to produce Iodine-125.

Uses

Iodine-125 has a variety of uses in the fields of biology, chemistry, and medicine. It is often used as a tracer in these fields due to its long half-life and its ability to emit gamma rays.

Medicine

In medicine, Iodine-125 is used in the treatment of certain types of cancer, including prostate cancer and brain tumors. It is also used in brachytherapy, a form of radiation therapy where a sealed radiation source is placed inside or next to the area requiring treatment.

Biology and Chemistry

In biology and chemistry, Iodine-125 is used as a tracer to study various biological and chemical processes. It is often used in radioimmunoassay, a technique used to measure the concentration of specific antigens in a sample.

Safety

As a radioactive isotope, Iodine-125 poses certain risks. It is important to handle it with care and to follow all safety guidelines to minimize exposure to radiation.

See also

• Iodine
• Isotopes of iodine
• Radioactive isotope
• Radioimmunoassay
• Brachytherapy