Abstract
In May, 2006, The Radiation Council in Japan drew up a guideline for the control of cosmic radiation exposure of aircraft crew. They have requested domestic airline companies to construct a countermeasure against possible large solar flares. It is still difficult, however, to predict cosmic radiation doses precisely and shortly soon after the occurrence of a big flare. It is necessary to establish a monitoring system to predict exact aviation doses according to real-time observations obtained with sensitive monitoring instruments and to advice airlines what to do with how much priority. Thus, in the present study, we investigate the possibility of setting a new system at the summit of Mt. Fuji, at 3,770m in height above the sea, for the continuos monitoring of cosmic radiation enviroment at high altitude. Experiments were carried out for about 20 days from August to September, 2007. The data were compared to those obtained on ground and Mt. Norikura (about 2,700m).
