HW15-2c-4 - 8-2 Radiation Detection Chap 8 increasesthe...

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8-2 Radiation Detection Chap. 8 increases the detector efficiency for charged particle detection since there is a higher chance a charged particle interacts in the tube gas. (c) Increasing the Z number of the wall material decreases the probability a low-energy photon can reach the interior of the detector through the wall. However, for a "thin" wall through which photons can pass, increasing Z increases the production of photoelectrons into the tube's interior and, thus, the detector's efficiency is increased. 3. For I-MeV photons, sketch how the detector efficiency of a proportional or GM chamber varies with the thickness of the cylindrical wall. Solution: For very thin walls, the photons will passthrough the detector with little chance
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