The plots below show spectra of particles entering the Columbus cabin due to two important incident radiation components, belt protons and cosmic ray protons. Both spectra are for solar minimum and quiet geomagnetic conditions. The trapped proton spectra was calculated by SPENVIS according to the AP8-MIN model. The cosmic ray proton spectra was calculated by CREME96 and takes the geomagnetic cut-off of low-energy protons into account.
Dose rates were evaluated at the center of the Columbus cabin by recording the deposited energy in a water sphere (radius = 50 cm).
| Radiation entering the Columbus cabin due to incident belt protons. For clarity also the incident belt proton spectra is shown. The dose rate for this setup is 3.41 uGy/h. |
| Radiation entering the Columbus cabin due to incident cosmic ray protons. For clarity also the incident cosmic ray proton spectra is shown. The dose rate for this setup is 6.47 uGy/h. |
The total dose rate due to both incident radiation components is 237 uGy/d. The results shown here were generated using Geant4 version 6.2p01. Geant4 was configured to use standard electromagnetic physics, data-driven low-energy neutron transport and the Binary Cascade model of hadronic physics at intermediate-energies.