Paul Layendecker's "WAY BACK WHEN" for Thursday, Dec. 22, 2022 1882 The first Christmas Tree with electric lights. Edward H. Johnson used a set of 80 red, white
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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