2. You place a C film with an unknown thickness in between an Am-241 source and a detector. After one minute has passed, the detector has registered 10275 counts. You then remove the film, and the detector registers 11000 counts during a one minute interval. How thick is the C target? Provide an answer in units of ug/cm2.

2. You place a C film with an unknown thickness in between an Am-241 source and a detector. After one minute has passed, the detector has registered 10275 counts. You then remove the film, and the detector registers 11000 counts during a one minute interval. How thick is the C target? Provide an answer in units of ug/cm2.