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T1H4O1R1O1N1S1
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THORONS is validvalid

THORON, a radioactive isotope of radon [n]

54,161 of 196,601 in NWL2023·also valid in CSW24

THORON, the radioactive isotope of radon given off by the decomposition of thorium [n]

249,304 of 280,887 in CSW24·also valid in NWL2023