Question 1
The decay constant, k, is given for each of the beta emitters below. Which one has the
shortest half life?
◦
115In, 4.29 × 10
-9 s
-1◦
131I, 9.94 × 10
-7 s
-1◦
42K, 1.55 × 10
-5 s
-1◦
217At, 21.4 s
-1Question 2
Which of the following isotopes is the
most stable?
◦
94Zr, 8.67 MeV/nucleon
◦
240Pu, 7.26 MeV/nucleon
◦
20Ne, 8.03 MeV/nucleon
◦
6He, 4.89 MeV/nucleon