R3D measured ionizing and non-ionizing radiation as well as cosmic radiation reaching the biological samples located on the EXPOSE-E. Due to errors in data transmission or temporary termination of EXPOSE power, not all data could be acquired. Radiation was not constant during the mission. At regular intervals of about 2 months, low or almost no radiation was encountered. The radiation dose during the mission was 1823.98 MJ m−2 for PAR, 269.03 MJ m−2 for UVA, 45.73 MJ m−2 for UVB, or 18.28 MJ m−2 for UVC. Registered sunshine duration during the mission was about 152 days (about 27% of mission time). The surface of EXPOSE was most likely turned away from the Sun for considerably longer time.
The highest daily averaged absorbed dose rate of 426 μGy per day came from the South Atlantic Anomaly (SAA) region of the inner radiation belt; galactic cosmic rays (GCR) delivered a daily absorbed dose rate of 91.1 μGy per day, and the outer radiation belt (ORB) source delivered 8.6 μGy per day.