- Q12 e) A scan is taken over ts = 10.0 minutes. If the total energy detected by the scanner exceeds Emin = 5×10−4J, an image appears due to radioactivity in a thyroid gland. Approximately how much time will elapse before radioactivity is no longer detected in a scan?
- Image below
Working backwards, P = Ae^kt form, i.e. EAts = Emin e^(ln2/τ x t).
Not sure how they get this formula in the first place with these values.