DECO: Cobalt-60 Tests (Quick Update) Posted on January 28, 2013September 6, 2016by Zach Irwin Hey all, Here is our set-up for running the aforementioned Cobalt-60 tests with the DECO App:Testing the DECO app with Cobalt-60 (emmiting gamma rays) and a HTC Wildfire. We will run with this set-up (source is 10cm away from the phone) until we get 1,000 events.