Validating Safecast data by comparisons to a U. S. Department of Energy Fukushima Prefecture aerial survey

• Published in: Journal of environmental radioactivity Vol. 171; no. C; pp. 9 - 20
• Main Authors: Coletti, Mark, Hultquist, Carolynne, Kennedy, William G., Cervone, Guido
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.05.2017; Elsevier
• Subjects: Aircraft; Data validation; Fukushima Daiichi; Fukushima Nuclear Accident; Government Agencies; INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Internet; Japan; Radiation Monitoring - methods; RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT; Safecast; United States; Volunteered geographic information; Volunteered geographic information; Data validation; Fukushima Daiichi; Safecast
• ISSN: 0265-931X; 1879-1700
• DOI: 10.1016/j.jenvrad.2017.01.005

Safecast is a volunteered geographic information (VGI) project where the lay public uses hand-held sensors to collect radiation measurements that are then made freely available under the Creative Commons CC0 license. However, Safecast data fidelity is uncertain given the sensor kits are hand assembled with various levels of technical proficiency, and the sensors may not be properly deployed. Our objective was to validate Safecast data by comparing Safecast data with authoritative data collected by the U. S. Department of Energy (DOE) and the U. S. National Nuclear Security Administration (NNSA) gathered in the Fukushima Prefecture shortly after the Daiichi nuclear power plant catastrophe. We found that the two data sets were highly correlated, though the DOE/NNSA observations were generally higher than the Safecast measurements. We concluded that this high correlation alone makes Safecast a viable data source for detecting and monitoring radiation.