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Iodine-125 (I-125) is a radiopharmaceutical and a medically important element in the atomic number of the periodic table. It is a gamma emitter that emits high energy (511 keV) photons (usually in the form of gamma photons). I-125 is most often used to kill cancer cells and is very effective against thyroid cancer cells.
This radionuclide was first produced in an accelerated reactor in 1957 by Svedberg and Bergström. Its medical use was first clinically demonstrated in 1953 by Dr. C. L. Hinkamp using iodine-131. I-125 was first used in therapeutic applications by Dr. Henry Smith in 1954 and by Dr. Francis C. Shattuck in 1956.
I-125 is used in radioisotope therapy for the treatment of thyroid carcinoma and also in the treatment of prostate cancer, which does not contain thyroglobulin receptors.
In radioiodine therapy for treatment of thyroid cancer, iodine-131 (131I) is delivered to the cancer cells, and is then absorbed by them. The absorbed iodine-131 emits a photon of energy, which kills the cells. The fact that the cell is killed is determined by the strength of the delivered radiation. The energy emitted in a nuclear decay event ranges from 0.026 to 2.73 MeV, which is the range of the gamma ray photons.
The thyroid gland is the primary target in radioiodine therapy, due to its high concentration of thyroglobulin receptors. The radiation from the emitted gamma photons kills the thyroid cells, which then release thyroglobulin, a protein which accumulates in thyroid cancer cells, which are themselves known to accumulate large amounts of iodine, which then concentrate in the cancer cells. The binding of radioiodine to the thyroglobulin in cancer cells, and the subsequent decay of the radioiodine-thyroglobulin complex, kill the cancer cells through the energy released by the decay of the radioiod 0b46394aab