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In a rare tour of the GPS ops floor, Lt. Col. Robert Wray, commander of the Space Force's 2nd Operations Squadron responsible for GPS operations, described the mission and why timing, more than anything, is critical.
Radioactivity is all around us, both from natural and artificial sources. But it is usually invisible, so how do we tell if it is there? There are quite a few passive and electronic methods for detecting and classifying radiation. This article investigates radioactivity, radioactive sources and ways to measure radioactivity electronically, including Geiger counters. by Dr David Maddison