Yep, sounds like Safecast. Safecast is a non-profit organization that collects precise radiation readings and shares them via their website and mobile app. We reported on its collaboration with Tokyo HackerSpace a year ago and recently featured its iOS app.
Brief, informative, and shot with a cinematographic eye, the short is well worth a watch. Safecast’s founders explain in a simple, direct way why they came up with the idea of collecting radiation measurements globally and how they got the ball rolling.
Cast a vote if you like what you see and check out the other documentaries that may interest you. The film is up for the Audience Choice Award, and voting closes on Dec. 2o.