This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
The' 1/2 life of CO60 is: 
Select and explain. 
A. 2.6 years, B. 5.2 years, C. 8 years, D. 3200 years
B: 5.2 years
Answer: B: 5.2 years 
Explanation: Ans. 5.2 years