<prompt> Half life of radioactive fluorine 18:-110 mins110 days110 secs110 hours  <response>: RADIOISOTOPE HALF UFE IODINE 131 8 DAYS IODINE 125 60 DAYS IODINE 124 4 DAYS IODINE 123 13 HOURS PHOSPHORUS-32 14 DAYS RADIUMRA-226 1622 Years Cobalt-60 5.2 Years Cesium -137 30 years TC-99m 6 hours Indiumlr-192 74.5 Days 18F18FDG 110 Aim Strontium 89 