A particular radioisotope emits two coincident gamma rays, each with 100% yield per decay, with no...

  

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A particular radioisotope emits two coincident gamma rays, each with 100% yield per decay, with no angular correlation between the photon directions. A sample is placed 10 cm from the surface of a 5 cm radius cylindrical detector along its axis. The intrinsic peak efficiency of the detector for y is 50%, and for Y it is 30%. (a) If the sample activity is low enough so that chance coincidences are negligible, calculate the ratio of the counts under the sum peak in the recorded pulse height spectrum to the counts under the y full-energy peak. (b) Calculate the rate at which events are recorded in the sum peak if the source activity is 100 kBq. For a detector resolving time of 3 us, what additional rate should be expected from chance coincidences between y and Y2? A particular radioisotope emits two coincident gamma rays, each with 100% yield per decay, with no angular correlation between the photon directions. A sample is placed 10 cm from the surface of a 5 cm radius cylindrical detector along its axis. The intrinsic peak efficiency of the detector for y is 50%, and for Y it is 30%. (a) If the sample activity is low enough so that chance coincidences are negligible, calculate the ratio of the counts under the sum peak in the recorded pulse height spectrum to the counts under the y full-energy peak. (b) Calculate the rate at which events are recorded in the sum peak if the source activity is 100 kBq. For a detector resolving time of 3 us, what additional rate should be expected from chance coincidences between y and Y2?

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To solve this problem well use the following information Sampletodetector distance d 10 cm Detector radius r 5 cm Intrinsic peak efficiency for Y 50 I... View the full answer