Emergency monitoring of environmental radiation and atmospheric radionuclides at Nuclear Science Research Institute, JAEA following the accident of Fukushima Daiichi Nuclear Power Plant

Due to the accident at the Fukushima Daiichi Nuclear Power Plant caused by the 2011 off the Pacific coast of Tohoku Earthquake, the emergency environmental radiation monitoring was conducted at the Nuclear Science Research Institute, Japan Atomic Energy Agency (JAEA). This report provides the monitoring results of ambient gamma-ray dose rate and atmospheric radioactivity concentration until the beginning of June 2011. Some anthropogenic radionuclides including Cs-134, Cs-137, I-131, I-132, Te-132 and Xe-133 were detected in the air samples. After 15 March 2011 the atmospheric radioactivity concentrations varied corresponding with the ambient gamma-ray dose rates. (author)