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The document summarizes a seminar held in Iwaki, Japan on March 1st, 2012 about collecting radiation measurement data and sharing it openly. It discusses how there was initially no information available about radiation levels, so volunteers created mobile Geiger counters and collected over 2.5 million measurements which were shared on a website. The goal was to create a network of volunteers called Safecast that could collect and share radiation data across Japan and eventually around the world.











































