Radiothorium - Law Dictionary Search Results
Home Dictionary Name: radiothoriumradiothorium
an earlier name for the thorium isotope thorium 228 given by its discoverer Otto Hahn It is a radioactive substance formed as one of series of products in the chain of radioactive decay of thorium Its immediate predecessor in the chain is Actinium 228 and it decays by alpha emission to radium 224 with a half life of 191 years The name radiothorium was given prior to the full understanding of the nature of isotopes of elements...
Mesothorium
a radioactive isotope of radium radium 228 with a half life of 58 years Also called mesothorium 1 or mesothorium I to distinguish it from a subsequent decay product mesothorium II actinium 228 It was discovered in 1907 by Otto Hahn as a decay product of thorium produced by decay of thorium 232 Mesothorium 1 radium 228 in turn produces actinium 228 mesothorium 2 as the first product of its radioactive decay and the actinium 228 in turn decays quickly half life of 6 hours to thorium 228 which is also called radiothorium the thorium 228 has a half life of 191 years shorter than that of the radium 228 It was discovered and named before full recognition of the nature of isotopes of the elements and was distinguished from other variants of radium by its half life and mode of production and decay It was also cheaper to prepare than other short lived radium isotopes and was thus sold commercially for use eg in making watch dials readable in the dark by painting the hands and hour marks with a ...
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