Element:Th
From Metabolomics.JP
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| + | Thorium was discovered in 1828 in the mineral thorite by Jons Berzelius. | ||
| + | Its name comes after Thor (Scandinavian god of war). | ||
| + | It is mildly radioactive and has 10 isotopes. Naturally occurring <sup>232</sup>Th goes 10 decay steps before reaching stable lead [[Element:Pb|<sup>208</sup>Pb]], and also emits thoron gas [[Element:Rn|<sup>220</sup>Rn]]. | ||
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| + | トリウムは1828年にベルゼリウスによりトーライト中に発見されました。 | ||
| + | 名前は北欧の軍神Thorに由来します。弱い放射能を持ち、10の同位体を持ちます。 | ||
| + | 天然のトリウム <sup>232</sup>Th は10段階の崩壊を経て鉛 [[Element:Pb|<sup>208</sup>Pb]] になり、途中、ラドンガス [[Element:Rn|<sup>220</sup>Rn]] を出します。 | ||
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{{Element | {{Element | ||
|Number=90 | |Number=90 | ||
Latest revision as of 06:23, 15 June 2011
Thorium was discovered in 1828 in the mineral thorite by Jons Berzelius. Its name comes after Thor (Scandinavian god of war). It is mildly radioactive and has 10 isotopes. Naturally occurring 232Th goes 10 decay steps before reaching stable lead 208Pb, and also emits thoron gas 220Rn.
[edit] Atomic Number
90
[edit] Atomic Name
Thorium(トリウム)
[edit] Stable Isotopes
| isotope | mass | isotopic abundance (%) |
|---|---|---|
| 232Th | 232.0380495 | 100 = (Natural radioactivity isotope) |
[edit] Radioisotopes
| isotope | half life | disintegration form |
|---|---|---|
| 228Th | 1.9116 years | alpha |
| 230Th | 7.538 x 104 years | alpha |
| 231Th | 25.52 hours | beta- |
| 232Th | 1.405 x 1010 years | alpha |
| 233Th | 22.3 minuites | beta- |
