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An earthquake, Tohoku region Pacific Coast earthquake, occurred on the 11thof March, 2011, and subsequent Fukushima nuclear power plant accidents havebeen stirring natural radiation around the author's office in Fukushima MedicalUniversity (FMU). FMU is located in Fukushima city, and is 57 km (35 miles)away from northwest of the Fukushima Daiichi nuclear power plant. This paperpresents three types of radiation survey undertaken through the unprecedentedaccidents at the campus and the hospital of FMU. First, a group of interestedpeople immediately began radiation surveillance; the group members wereassembled from the faculty members of "Life Sciences and Social Medicine" and"Human and Natural Sciences". Second, the present author, regardless of theearthquake, had serially observed natural radiations such as gamma radiation inair with NaI scintillation counter, atmospheric radon with Lucas cell, andsecond cosmic rays with NaI scintillation. Gamma radiation indicated mostdrastic change, i.e., peak value (9.3 times usual level) appeared on March 16,and decreased to 1.7 times usual level after two months. A nonlinear leastsquares regression to this decreasing data gave short half-life of 3.6 days andlong half-life of 181 days. These two apparent half-lives are attributed to twogroups of radioisotopes, i.e., short half-life one of I-131 and long half-lifeones of Cs-134, Cs-137 and Sr-90. Also, atmospheric radon concentration becamehigh since a stop of ventilation, while second cosmic rays did not show anyresponse. Third, late April, 2011, a team of radiation dosimetry under thedirect control of Dean, School of Medicine, was established for thecontinuation of radiation survey in the campus and the hospital of FukushimaMedical University.

Radiation Measurements at the Campus of Fukushima Medical University  through the 2011 off the Pacific Coast of Tohoku Earthquake and Subsequent  Nuclear Power Plant crisis