iodine-125

Noun
  1. is a type of:
    • radioisotope - a radioactive isotope of an element; produced either naturally or artificially
    • atomic number 53, i, iodin, iodine - a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)

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