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Sir William Ramsay discovered neon, argon, krypton, xenon, helium, and radon, which all formed a group called Noble gasses.
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The isotope of mass 220 was discovered in 1899 by Ernest Rutherford, it is a product of the radioactive decay of an isotope of thorium or thoron.
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Radon-222 was discovered by a German chemist Friedrich Ernst Dorn
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Radon was originally called Riton meaning shinning. Fredrich E. Dorn named radon, radon because he described it as radium emanation because it arose from the element radium.
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In the early 1940s, Curtiss and Davis developed a radon emanation and counting system.
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From 1944 until 1974, the federal government funded radiation experiments on humans.
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There was a nuclear power plant disaster accident that occurred causing the death of 32 people and 12 others to suffer from radiation burns.
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The EPA tested radon levels in more than 31,000 classrooms in 927 schools across the United States.
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U.S. Surgeon General issued a national health advisory regarding radon exposure in 2005.
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It was a major earthquake that caused a 15-meter tsunami disabling the power supply and cooling of 3 Fukushima Daiichi reactors, causing a nuclear accident.
