====== Iodine 125 ======
Iodine 125 or [[I-125]] is a [[radioisotope]] of [[iodine]] which has uses in biological assays, [[nuclear medicine]] imaging and in [[radiation therapy]] as [[brachytherapy]] to treat prostate cancer and brain tumors. It is the second longest-lived radioisotope of iodine, after iodine-129.