英语词汇“radiothorium”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

radiothorium n.

Brit.

/ˌreɪdɪə(ʊ)ˈθɔːrɪəm/

U.S.

/ˌreɪdioʊˈθɔriəm/

now chiefly historical an isotope of thorium (thorium-228) which occurs in small amounts in natural thorium and is formed by the beta decay of actinium-228, and which itself decays by alpha emission with a half-life of 1.9 years; (also) a mixture of radioactive isotopes of thorium, actinium, and radium, present as decay products in natural thorium.

ΘΚΠ

the world > matter > chemistry > elements and compounds > metals > specific elements > thorium > [noun]

thorium1832

thorinum1836

radiothorium1905

1905 Jrnl. Chem. Soc. 88 ii. 789 The author [sc. Ramsay] hence considers it very probable that the radioactive power of thorium is to be attributed to small quantities of this element, radiothorium.

1921 London, Edinb., & Dublin Philos. Mag. 6th Ser. 41 572 A much weaker source of α rays was obtained by dipping a nickel plate for a few seconds in a more dilute solution of radio~thorium.

1950 Thorpe's Dict. Appl. Chem. (ed. 4) X. 435/1 The term radiothorium is loosely applied to the mixture of isotopes that can be separated from natural thorium and which contain the bulk of its activity. Such radiothorium consists of a mixture of meso-Th i, meso-Th ii, radium, and actinium isotopes, respectively, Th-X, a radium isotope, and their decay products, including true radiothorium or ²²⁸Th.

2001 Hindu (Nexis) 17 May Radiothorium had been characterized as a compound of ‘Th-x and stupidity’. Hahn soon convinced the skeptics in Rutherford's laboratory of the reality of his substance.

单词	radiothorium
释义	> as lemmas radiothorium radiothorium n. Brit. /ˌreɪdɪə(ʊ)ˈθɔːrɪəm/ , U.S. /ˌreɪdioʊˈθɔriəm/ now chiefly historical an isotope of thorium (thorium-228) which occurs in small amounts in natural thorium and is formed by the beta decay of actinium-228, and which itself decays by alpha emission with a half-life of 1.9 years; (also) a mixture of radioactive isotopes of thorium, actinium, and radium, present as decay products in natural thorium. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > thorium > [noun] thorium1832 thorinum1836 radiothorium1905 1905 Jrnl. Chem. Soc. 88 ii. 789 The author [sc. Ramsay] hence considers it very probable that the radioactive power of thorium is to be attributed to small quantities of this element, radiothorium. 1921 London, Edinb., & Dublin Philos. Mag. 6th Ser. 41 572 A much weaker source of α rays was obtained by dipping a nickel plate for a few seconds in a more dilute solution of radio~thorium. 1950 Thorpe's Dict. Appl. Chem. (ed. 4) X. 435/1 The term radiothorium is loosely applied to the mixture of isotopes that can be separated from natural thorium and which contain the bulk of its activity. Such radiothorium consists of a mixture of meso-Th i, meso-Th ii, radium, and actinium isotopes, respectively, Th-X, a radium isotope, and their decay products, including true radiothorium or ²²⁸Th. 2001 Hindu (Nexis) 17 May Radiothorium had been characterized as a compound of ‘Th-x and stupidity’. Hahn soon convinced the skeptics in Rutherford's laboratory of the reality of his substance. extracted from radio-comb. form² < as lemmas
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> as lemmas