Fig 1.
Schematic diagram showing the photon irradiation setup.
Fig 2.
Schematic diagrams of photon interaction mechanisms considered in the NRUphoton code.
Table 1.
Percentage of photon interaction mechanisms (coherent scattering, incoherent scattering and photoelectric effect) for the ionizing photon energies of 10 keV, 100 keV and 1 MeV, obtained from photo-atomic cross-section data.
Fig 3.
Energy-dependent photo-atomic cross-section data for (a) 1H, (b) 12C, (c) 14N and (d) 16O nuclei.
Fig 4.
Absorbed photon doses in the cell layer for three incident photon energies of 10 keV, 100 keV and 1 MeV impinging perpendicularly onto the water medium layer with varying thickness computed using the MCNP5 and NRUphoton code.
Fig 5.
Interaction fractions of photons with (a) 1H, (b) 12C, (c) 14N and (d) 16O within cell layer for 10 keV incident photons.
Fig 6.
Interaction fractions of photons with (a) 1H, (b) 12C, (c) 14N and (d) 16O within cell layer for 100 keV incident photons.
Fig 7.
Interaction fractions of photons with (a) 1H, (b) 12C, (c) 14N and (d) 16O within cell layer for 1 MeV incident photons.
Fig 8.
Fractions of interaction mechanisms of 10 keV photons for (a) coherent scattering, (b) incoherent scattering and (c) photoelectric interaction.
Fig 9.
Fractions of interaction mechanisms of 100 keV photons for (a) coherent scattering, (b) incoherent scattering and (c) photoelectric interaction.
Fig 10.
Fractions of interaction mechanisms of 1 MeV photons for (a) coherent scattering, (b) incoherent scattering and (c) photoelectric interaction.
Fig 11.
Electron ejection fractions during a photoelectric interaction from various atomic subshells for (a) 10 keV, (b) 100 keV and (c) 1 MeV incident photon energies, for a range of water medium thicknesses.
Fig 12.
Penetration fractions of photons from the cell-medium system for photons with incident energies of (a) 10 keV, (b) 100 keV and (c) 1 MeV.
Fig 13.
Angular distributions of photons exiting the medium layer and subsequently undergoing interactions within the cell layer, for incident photon energies of (a) 10 keV, (b) 100 keV and (c) 1 MeV.
Fig 14.
Cumulative distribution functions (CDFs) for incoherent and coherent scattering.
Fig 15.
Average angular distributions of photons exiting the medium layer and subsequently undergoing interactions within the cell layer, for incident photon energies of (a) 10 keV, (b) 100 keV and (c) 1 MeV.
Fig 16.
Schematic diagram showing photons impinging an ionization chamber (model TN 30 013, PTW Farmer® Chamber).
Table 2.
Dose delivered per incident photon in the IOC from photons with different incident energies from the source.
Fig 17.
Electron hits on the exposed cell array with 104 cells for 100 keV incident photons for administered doses of (a) 10 mGy, (b) 20 mGy, (c) 50 mGy, (d) 100 mGy and (e) 500 mGy.
Table 3.
Number of cells suffering at least one electron hit for different incident photon energies and for different administered doses.