Fig 1.
Interaction cross-section data for 1H, 12C, 14N and 16O that are the major nuclei in a modeled human cell or organ.
The four different interactions shown in the figure include coherent, incoherent, photoelectric effect and pair production. These were obtained from the National Institute of Standards and Technology (NIST) XCOM library homepage: https://physics.nist.gov/PhysRefData/Xcom/html/xcom1.html.
Fig 2.
The Oak Ridge National Laboratory (ORNL) adult male human phantom [1] used in the present work.
Fig 3.
Absorbed photon dose per photon in the brain, spine and thyroid of the adult male phantom for no shielding, 10 and 20 cm thick concrete and lead shielding.
The error bars represent the statistical uncertainties associated with Monte Carlo simulation. Some of the error bars are smaller than symbols.
Fig 4.
Graphical representation of photon tracks for the cases with (a) no shielding, (b) 10 cm concrete, (c) 20 cm concrete, (d) 10 cm lead and (e) 20 cm lead shielding. Blue dots: positions of photon interactions; green lines: links between positions of multiple interaction (i.e., blue dots); green open circle: positions at which photons would not undergo further multiple scattering. Some symbols may have overlapped with one another. For a better understanding, the readers could cross check with the video clips, where the symbols are displayed in sequence.
Fig 5.
Graphical representation of the energy of interacting photons for the cases with (a) no shielding, (b) 10 cm concrete, (c) 20 cm concrete, (d) 10 cm lead and (e) 20 cm lead shielding. The lighter yellow dots represent photons with higher energy, while darker yellow dots represent photons with lower energy.