Question: In a PIXE experiment, an element with A = 80 forms 0.001 percent by weight of a thin foil whose mass is 0.35 mg/cm 2

In a PIXE experiment, an element with A = 80 forms 0.001 percent by weight of a thin foil whose mass is 0.35 mg/cm². The foil is bombarded with a 250 nA proton beam for 15 minutes. The cross section for exciting the L shell is 650 b. If the probability that the excited atom will emit an L x ray is 0.60 and the overall efficiency of the x-ray detector is 0.0035, how many counts will the detector record during the 15-minute bombardment?

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