…It is named after the Greek word technētos, which means “artificial.” In 1925, Germans WKF Noddack and IE Tacke discovered element 43, along with element 75 rhenium, in platinum ore or columbite, and named it masurium, but other researchers were unable to confirm its existence, and its existence was denied. Among the isotopes, the particularly long-lived ones are 98 Tc (half-life 4.2×10 6 years), 97 Tc (2.6×10 6 years), and 99 Tc (2.14×10 5 years). With half-lives of this length, even if technetium existed when the Earth was formed, it is unlikely that it would have remained to this day. … *Some of the terminology that mentions "masurium" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…〈人工の〉を意味するギリシア語technētosに因んで命名された。1925年にドイツのノダックW.K.F.NoddackとタッケI.E.Tackeが白金鉱あるいはコロンバイトから75番元素レニウムとともに43番元素を発見したとし,マスリウムmasuriumと名づけたが,他の研究者からは確認されず,その存在は否定された。同位体中でとくに長寿命のものは98Tc(半減期4.2×106年),97Tc(2.6×106年),99Tc(2.14×105年)であり,この程度の半減期では,地球ができたときにテクネチウムが存在していたとしても,現在まで残っているとは考えられない。… ※「masurium」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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