Question

Numbers per channel 3x 103 2x103 1x103 137Cs - Y (35mm x 30mm) Na I (Tl) Backscatter peak 184 keV Compton Edge 478 keV 0 25 50 Channel Number Photopeak 662 keV 75 100

          Numbers per channel
3x 10<sup>3</sup>
2x10<sup>3</sup>
1x10<sup>3</sup>
<sup>137</sup>Cs - Y
(35mm x 30mm) Na I (Tl)
Backscatter peak
184 keV
Compton Edge
478 keV
0
25
50
Channel Number
Photopeak
662 keV
75
100

Added by Veronica C.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Adriano Chikande

Step 1

The graph shows a Cs-137 gamma spectrum with three main features: a backscatter peak at 184 keV, a Compton edge at 478 keV, and a photopeak at 662 keV. Show more…

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A typical pulse amplitude spectrum of Cs-137 with an energy of Ey = 662 keV was obtained with a (38 mm x 38 mm) NaI (Tl) crystalline counter. a) Explain how the photopeak, Compton edge, and backscatter peak occur. b) Find the equation that will give the backscatter peak's Kb energy. Also, find the value of Kb. c) Calculate the energy Ec of the Compton edge. d) Find the resolution of the detector. Photopeak Numbers per channel: 1x10 BT CsY 38 mm Backscatter peak Compton Edge 78 79 25 Channel Number