Wide Indoor Air radon Survey for Elementary, Middle and High Schools at Ulju County in Korea

Abstract

Radon exists in nature as the form of radioactive rare gas and is one of important issues of environmental radiation due to its radiological hazardousness. Ulju County is one of administrative district of Ulsan which has the highest density of industry complex in Korea. Wide radon survey for Ulju County were carried out by seasons to secure radiological safety and confirm the basic information for reduction of the resident exposure. To survey radon radioactivity concentration, 114 passive detectors of alpha track were placed in 57 schools of Ulju County at each season and the radon radioactivity concentration was measured during summer, autumn and winter. The radon radioactivity concentration was analyzed on the change of season in the different schools in comparison with the previous survey results.