The reduction of the radioactive air dose rate from Fukushima Daiichi Nuclear Disaster (2011) to 2018 in the Tokyo metropolitan area

How do you think Tokyo has changed since the seventh year of the Fukushima Daiichi nuclear disaster? Today, people living in Tokyo and working in Tokyo do not routinely recognize the term radiation. Meanwhile, I was given the opportunity to participate in the measurement project of the MGRI (Medical Geological Research Institute), which has been measuring the radioactive radiation dose from the Fukushima Daiichi Nuclear Power Station neighborhood to Tokyo after the Fukushima Daiichi nuclear disaster. MGRI has been accumulating radioactive radiation dose measurement data of Chiba Ragi To Plume. And other areas ranging from Fukushima Daiichi Nuclear Power Plant to the Kanto area from immediately past accidents from the past. In October 2018, I was asked to measure the radiation dose of the Olympic facility mainly in Tokyo Olympic Games. I am not a Geological researcher, but I participated as a citizen of Tokyo. In this paper we will report on this measurement result and compare the results measured in the same place in the past. (author)