Neutron activation analysis is an analytical technique in which a sample of material is bombarded with neutrons from a fission reactor. When a 35.0-g aluminum can is irradiated, it has an initial activity of 40.0 curies (Ci). The safety office won’t let you touch anything having an activity in excess of 0.100 Ci. Assuming all the radioactivity is from ²⁸Al, which has an halflife of 2.28 min, how many minutes do you have to wait after bombardment before you can handle the can safely?

a. 17.0 min

b. 1.32 × 10³ min

c. 19.7 min

d. 478 min

e. 476 min