| Information | |
|---|---|
| has gloss | eng: Osmium (Os) has seven naturally-occurring isotopes, 5 of which are stable: 187Os, 188Os, 189Os, 190Os, and (most abundant) 192Os. The other two, 184Os and 186Os, have enormously long half-lives and for practical purposes can be considered to be stable as well. 187Os is the daughter of 187Re (half-life 4.56 x 1010 years) and is most often measured in an 187Os/188Os ratio. This ratio, as well as the 187Re/187Os ratio, have been used extensively in dating terrestrial as well as meteoric rocks. It has also been used to measure the intensity of continental weathering over geologic time and to fix minimum ages for stabilization of the mantle roots of continental cratons. However, the most notable application of Os in dating has been in conjunction with iridium, to analyze the layer of shocked quartz along the K-T boundary that marks the extinction of the dinosaurs 65 million years ago. |
| lexicalization | eng: Isotopes of osmium |
| subclass of | (noun) one of two or more atoms with the same atomic number but with different numbers of neutrons isotope |
| has instance | e/Osmium-162 |
| has instance | e/Osmium-163 |
| has instance | e/Osmium-164 |
| has instance | e/Osmium-165 |
| has instance | e/Osmium-166 |
| has instance | e/Osmium-167 |
| has instance | e/Osmium-168 |
| has instance | e/Osmium-169 |
| has instance | e/Osmium-170 |
| has instance | e/Osmium-171 |
| has instance | e/Osmium-172 |
| has instance | e/Osmium-173 |
| has instance | e/Osmium-174 |
| has instance | e/Osmium-175 |
| has instance | e/Osmium-176 |
| has instance | e/Osmium-177 |
| has instance | e/Osmium-178 |
| has instance | e/Osmium-179 |
| has instance | e/Osmium-180 |
| has instance | e/Osmium-181 |
| has instance | e/Osmium-182 |
| has instance | e/Osmium-183 |
| has instance | e/Osmium-184 |
| has instance | e/Osmium-185 |
| has instance | e/Osmium-186 |
| has instance | e/Osmium-187 |
| has instance | e/Osmium-188 |
| has instance | e/Osmium-189 |
| has instance | e/Osmium-190 |
| has instance | e/Osmium-191 |
| has instance | e/Osmium-192 |
| has instance | e/Osmium-193 |
| has instance | e/Osmium-194 |
| has instance | e/Osmium-195 |
| has instance | e/Osmium-196 |
| has instance | e/Osmium-197 |
| Meaning | |
|---|---|
| Japanese | |
| has gloss | jpn: オスミウム(Os)は7種類の天然に生成する同位体を持ち、そのうちの5種類187Os、188Os、189Os、190Os、192Osは安定同位体である。このうち190Osが最も豊富に存在する。他の2つ184Osと186Osは非常に長い半減期を持つ。187Osは190Re（半減期4.56×1010年）から生成され、187Os/188Osの比や187Rn/187Osの比はしばしば測定され、地球や小惑星の岩石の年代測定に用いられる。また、地質学的年代での地球の気象の測定や大陸クラトンのマントルが安定した年代の測定にも用いられる。しかし、オスミウムの同位体の最も知られた使い方は、イリジウムと組み合わせた、K-T境界に沿った衝撃石英の表層の年代測定である。標準原子量は190.23(3) uである。 |
| lexicalization | jpn: オスミウムの同位体 |
| Chinese | |
| has gloss | zho: 鋨 (原子質量單位:190.23(3) )的同位素 |
| lexicalization | zho: 鋨的同位素 |
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