1. ANSI (2002) Radiation safety for personnel security screening systems. ANSI standard N43.17. American National Standards Institute, Washington, DC
2. AS&E (2005) Z Backscatter. http://www.as-e.com/products_solutions/z_backscatter.asp. Accessed June 2020
3. ASTM (2002) Standard practice for evaluating the imaging performance of security X-ray Systems. ASTM F792-01e2, ASTM International, West Conshohocken
4. Beck HL, Gogolak CV, Miller KM, Lowder WM (1980) Perturbations on the natural radiation environment due to the utilization of coal as an energy source. In: Gesell TF, Lowder WM (eds) The natural radiation environment III, vol 2. US Department of Energy, Washington, DC, pp 1152–1558
5. Cameron RJ, Fritz BG, Hurlbut C, Kouzes R, Ramey A, Smola R (2015) Fogging in polyvinyl toluene scintillators. IEEE Trans Nucl Sci 62:368–371