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. 2016 Apr 12;6:80. doi: 10.3389/fonc.2016.00080

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Copyright © 2016 Hueso-González, Fiedler, Golnik, Kormoll, Pausch, Petzoldt, Römer and Enghardt.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Mean free path λ of photons of energy E_γ in different representative materials: water (body), CsI (detector), and Pb (collimator). λ is calculated as the inverse of the total attenuation factor μ that is extracted from (63). Explicit points at typical energies are drawn: 140-keV for ⁹⁹Tc (nuclear medicine), 511-keV for PET, and 4-MeV for PGI.