抄録
Exposure to cosmic rays in commercial airplanes was outlined. Although cosmic rays are a type of natural radiation, the magnitude of their dose is significant in airplanes. Therefore, there may be demands to regulate the dose of cosmic rays received by aircrews. In order to find reasonable countermeasures, the first prerequisite is to estimate the dose of cosmic rays precisely. In this paper, various problems in the measurement and calibration of cosmic rays as well as dose estimation and the method of control were outlined. Data of in situ measurements and those obtained by model calculations are presented, and factors which affect the level of the dose are discussed. In addition, potential dose ranges received during various flight routes are shown for various dose conversion parameter sets. Characteristics of domestic flights in Japan are also mentioned.
