Yodo125

Yodo125 refers to the radioactive isotope iodine-125 (I-125). In many contexts, especially in Spanish- or Portuguese-language sources, it is written as yodo-125. I-125 is used primarily in medicine and research, where its relatively long half-life and low-energy emissions are advantageous for certain applications.

Iodine-125 has a half-life of about 59.4 days and decays by electron capture. It emits low-energy gamma photons, typically in the 27 to 35 keV range, which allows effective local dose delivery with limited penetration beyond the target tissue. These properties make I-125 suitable for implanted and localized radiation sources while minimizing exposure to surrounding tissues.

Production and forms: I-125 is produced in nuclear reactors through neutron irradiation of tellurium targets, followed by chemical separation. It is supplied as sealed radioactive sources (often in the form of seeds or plaques) or as radiopharmaceuticals labeled with I-125 for research use.

Medical and research uses: The most common medical applications are brachytherapy, where I-125 seeds are implanted near or within a tumor to provide ongoing radiation therapy, and ocular plaque therapy for certain eye tumors. It is also used in molecular biology and tracer studies as a radiolabel to investigate biological processes. Because of its relatively low energy, I-125 is typically used in contained, controlled settings with appropriate shielding and regulatory oversight.

Safety and regulation: Handling I-125 requires compliance with radiation safety standards, including shielding, monitoring, proper storage, and licensed procurement and disposal. Its use is subject to national and international regulations governing radioactive sources and radiopharmaceuticals.