Effects of near-source photon scattering at the energy of

Compton scattering on electrons in materials in the vicinity of low-energy photon-emitting atoms and in the vicinity of the detector sensitive volume causes a continuous distribution below the full-energy peak (the “shoulder”). To study effects of the near-source Compton scattering, a collimator was used in front of a planar germanium detector to reduce the near-detector scattering. The measurements show that even a small mass in vicinity of...