Dose measurement of natural background radiation in Kansai area with reference to environmental factor and measurement condition

The dose measurements of natural background radiation in Kansai area were carried out with reference to environmental factors and measurement conditions, in order to gather and compile the data for the educational purpose of nuclear power and radiation. We could acquire several dose data which agreed with environmental factors and measurement conditions, such as 1) high dose rate in a tunnel, 2) low dose rate on/near the sea and 3) high dose rate at the surface of huge granite, by using simplified type of radiation monitors which were developed for the educational purpose. Moreover, the data were obtained that cosmic rays were almost shielded by the solid and sand in a tunnel with BGO scintillator. (author)