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Definition of Mesothorium
1. n. A radioactive product intermediate between thorium and radiothorium, with a period of 5.5 years.
Medical Definition of Mesothorium
1. The first two disintegration products of thorium; mesothorium 1 is 228Ra, a beta emitter with a half-life of 6.7 years, decaying into mesothorium 2, which is 228Ac, a beta emitter with a half-life of 6.13 hr, which disintegrates to radiothorium (228Th). (05 Mar 2000)
Lexicographical Neighbors of Mesothorium
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