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. Author manuscript; available in PMC: 2017 Dec 22.
Published in final edited form as: Radiat Phys Chem Oxf Engl 1993. 2015 Jun 11;115:127–134. doi: 10.1016/j.radphyschem.2015.06.011

Fig. 2.

Fig. 2

Representation of the possible paths of γ-rays emitted from a radionuclide (black dot) within a cylindrical solid. We assume the height, z, of the cylinder (typically a fuel rod) to be greater than the penetrating power of the γ radiation. R is the distance that the γ-ray travels in the solid. For the cylindrical boundary, the angle of incidence is a combination of δ1 and δ2.