Monitoring radioactivity around Lake Izunuma-Uchinuma and in its watershed

Abstract

Radioactivity monitoring was conducted around Lake Izunuma-Uchinuma and in its watershed. Lake Izunuma-Uchinuma is located 140 km north of the Fukushima Daiichi Nuclear Power Station. The average radioactivity at the Izunuma-Uchinuma Sanctuary Center, which is located on the north side of Lake Izunuma, was calculated with data gathered from the 28th of September, 2011 to the 22nd of February, 2012. The average radioactivity at 1 m above ground was measured to be 0.08 μSv / h (N = 22, range: 0.07 - 0.09) and at 10 cm above ground was 0.10 μSv / h (N = 22, range: 0.07 - 0.11).