Question

7-3. In measuring the maximum intensity of a certain diffraction line with a sealer, 2048 pulses were counted in 1.9 sec. When the "diffraction background" a few degrees away from the line was measured, 2048 pulses were counted in 182 seconds. The average counting rate determined over a long period of time with the x-ray tube shut off was 2.2 cps. (a) What is the ratio of the maximum intensity of the line to that of the "diffraction background"? (b) What is the probable error in each of these intensities? (c) How long must the "diffraction background" be counted in order to obtain its intensity with the same accuracy as that of the diffraction line?

          7-3. In measuring the maximum intensity of a certain diffraction line with a sealer, 2048 pulses were counted in 1.9 sec. When the "diffraction background" a few degrees away from the line was measured, 2048 pulses were counted in 182 seconds. The average counting rate determined over a long period of time with the x-ray tube shut off was 2.2 cps. (a) What is the ratio of the maximum intensity of the line to that of the "diffraction background"? (b) What is the probable error in each of these intensities? (c) How long must the "diffraction background" be counted in order to obtain its intensity with the same accuracy as that of the diffraction line?

Added by Keith G.

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