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In page Radon:
"An early-20th-century form of quackery was the treatment of maladies in a radiotorium.[1] It was a small, sealed room for patients to be exposed to radon for its "medicinal effects". The carcinogenic nature of radon due to its ionizing radiation became apparent later. Radon's molecule-damaging radioactivity has been used to kill cancerous cells,[2] but it does not increase the health of healthy cells.[citation needed] The ionizing radiation causes the formation of free radicals, which results in cell damage, causing increased rates of illness, including cancer.
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