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46 UEC Int’l Mini-Conference No.52

Evaluating Radiation Data Discrepancies in Fukushima: A

Comparative Study of Official and Safecast Measeurements

Post-decontamination

Imam Ghazali YASMINT , Kayoko YAMAMOTO, Yo ISHIGAKI
∗
Joint Doctoral Program for Sustainability Research
The University of Electro-Communications
Tokyo, Japan

Keywords: ArcGIS, Fukushima Accident, Post-decontamination, Radiation Monitoring, Safecast.

Abstract
The Fukushima nuclear accident in 2011 resulted in widespread contamination of multiple areas
with elevated levels of radioactivity. The Japanese government has made numerous initiatives to de-
contaminate these areas until they were considered completely decontaminated in 2018, except for the
Difficult-to-return zone. Although decontamination efforts have been completed in nearly all areas, it
remains crucial to maintain radiation monitoring to assure the safety and security of returning residents.
The Japan Atomic Energy Agency (JAEA) and the Nuclear Regulation Authority (NRA) are govern-
ment agencies responsible for official monitoring. At the same time, non-profit organizations such as
Safecast facilitate public participation. This study involved comparing official measurement data with
Safecast data after the decontamination process. The comparative analysis was conducted utilizing the
ArcGIS software. Assessing community data is crucial for verifying accuracy, enhancing methods, and
informing the public about radiation safety. The comparison shows discrepancies and offers valuable
insights to improve future radiation monitoring.

∗
The author is supported by (SESS) MEXT Scholarship.