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Thorium is radioactive and produces the radioactive gas radon-220 as one of its decay products. Moreover, when heated to incandescence, the thorium volatilizes its in-growth radio-daughters, particularly radium-224. Despite its very short half-life, radium quickly replenishes from its radio-parent (thorium-228), and every new heating of the ...
Hahn diligently amassed radioactive material by collecting small amounts from household products, such as Americium from smoke detectors, thorium from camping lantern mantles, radium from old clocks he had obtained from an antique store, and tritium from gunsights.
In the 1980s it was reported that Thorium's radio-daughters (Decay products) could be volatilized and released into the air upon incandescence of the mantle. [25] [26] A lawsuit (Wagner v. Coleman) was brought against Coleman. The company changed its formulation to use non-radioactive materials, which apparently cost less and last longer. [27] [28]
Exposure is raised for people who live near thorium deposits or radioactive waste disposal sites, those who live near or work in uranium, phosphate, or tin processing factories, and for those who work in gas mantle production. [189] Thorium is especially common in the Tamil Nadu coastal areas of India, where residents may be exposed to a ...
Early in the 20th century, there was vigorous debate over whether candoluminescence is required to explain the behavior of Welsbach gas mantles or limelight. One counterargument was that since thorium oxide (for example) has much lower emissivity in the near infrared region than the shorter wavelength parts of the visible spectrum, it should ...
Lindsay Light manufactured mantles for gas lights using radioactive thorium. [1] McCoy moved to Los Angeles in 1927. There he continued to study rare earths as a guest researcher in the laboratory of B. A. Stagner, and building his own private laboratory at home over his garage. [4] McCoy died on May 7, 1945 [1] in Los Angeles, California. [9]
AGM2015: A worldwide v̄ e flux map combining geoneutrinos from natural Uranium-238 and Thorium-232 decay in the Earth's crust and mantle as well as manmade reactor-v̄ e emitted by power reactors worldwide. Environmental radioactivity is part of the overall background radiation and is produced by radioactive materials in the human environment.
Yttrium is used in gas mantles for propane lanterns as a replacement for thorium, which is radioactive. [71] Garnets. Nd:YAG laser rod 0.5 cm (0.20 in) in diameter ...