On November 30, 2017, Radiation Medical Science Center for Fukushima Health Management Survey, Fukushima Medical University has reported the results of the second round of the Thyroid Ultrasound Examination (started from April 2014 to March 2016). Areas within Fukushima Prefecture were divided into four groups based on individual external doses; 13 Evacuation Zone municipalities (the highest dose area), the Nakadori (Central Fukushima, the middle dose area), the Hamadori (the Pacific coast below and above the Evacuation Zone, the lower dose area) and Aizu area (inland, the lowest dose area). Prevalence of thyroid cancer for the location groups were 21.4/100,000/year for the highest dose area, 13.4/100,000/year for the middle dose area, 9.9/100,000/year for the lower dose area and 7.7/100,000/year for the lowest dose area. External radiation dose was clearly associated with thyroid cancer prevalence among Fukushima children after the Fukushima Dai-ichi nuclear power plant accident. However, the present ICRP drafting committee stated that childhood thyroid cancer cases found in Fukushima Prefecture are unlikely to be the result of radiation exposure after the accident. (line 3254`3255)