Question

Which radioisotopes have the same decay mode and have half-lives greater than

hour?
(1) Au-198 and N-16 (3) 1-131 and P-32
(2) Ca-37 and Fe-53 (4) Tc-99 and U-233

Answer 1

The answer is (3) I-131 and P-32. They both have β- decay mode and with half-lives greater than hour. You can get these half-lives and decay mode from table N selected radioisotopes.

Answer 2

The correct answer is (3)

I-131 and P-32

The explanation:

according to attached table:

- we can see that the half life of p 32 is 14.28d (more than one hour)

- and the half life of I-131 is 8.021 d (more than one hour)

and They both have β- decay mode and with half-lives greater than hour.