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Interactions with surroundings
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In any practical application, a detector used for gamma-ray spectroscopy will be surrounded by other materials which contribute to its response. These materials are potential sources of secondary radiation, produced via interactions of the gamma-ray photons emitted from the source. The contributions arise from:
  • Photoelectric absorption;
  • Compton scattering; and
  • Pair production in the surrounding material.

If the secondary radiations reach the detector they can influence the shape of the recorded spectrum to a noticeable extent.

This section contains the following topics:

Interactions in shielding
Graded shield
Backscattered peaks
Pair production in shielding
Real size detectors
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