This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nuclear medicine, Subject name: Radiology
Iodine 123 has a half life of? 
Select and explain. 
A. 6 hours, B. 8 days, C. 13 hours, D. 14 days
C: 13 hours
Answer: C: 13 hours 
Explanation: Impoant Radioisotopes Half Life RADIOISOTOPE HALF LIFE IODINE 131 8 DAYS IODINE 125 60 DAYS IODINE 124 4 DAYS IODINE 123 13 HOURS PHOSPHORUS -32 14 DAYS RADIUM (RA-226) 1622 years Cobalt -60 5.2 years Cesium - 137 30 years TC- 99m 6 hours Iridium (Ir-192) 74.5 Days 18F (18FDG) 110 min Strontium 89 50.5 days