Gamma radiation exposure of air crew in Tehran-Bandarabbas flights

Different researches have been performed on natural exposure of cosmic rays and their effects on the human health. Monitoring of cosmic derived gamma ray exposure of air crews and passengers is the subject of the current study. In this paper, the control able variations of the cosmic ray flux in the atmosphere and the cosmic radiation exposure at flight altitudes will be discussed. For this study, the exposure rates to gamma ray, in an energy range of 50 keV-1.5 MeV, for the Tehran-Bandarabbas air flights have been measured. The results show that the maximum dose rate at 3000 ft (about 9 km) is 15-20 times higher than on the ground base. Also, the dose rate for this pathway is about 1.87μSv/h which for 500 hours flights per year it is estimatal to be 935μSv. This number is less than human permissible dose rate of 1 mSv/year.