promethiumn.

Brit.

/prəˈmiːθɪəm/, U.S.

/proʊˈmiθiəm/

Forms: 1900s– prometheum, 1900s– promethium.

Origin: From a proper name, combined with an English element. Etymons: proper name Prometheus , -ium suffix.

Etymology: < the name of Prometheus (see Prometheus n.) + -ium suffix (see quot. 1948²).

A rare, radioactive, metallic chemical element of the lanthanide series, atomic number 61, which was first produced artificially in a nuclear reactor and is present in trace amounts as a fission product in uranium ores. Symbol Pm. Cf. illinium n.The longest-lived isotope (promethium-145) has a half-life of about 18 years.

ΘΚΠ

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

illinium1926

florentium1927

promethium1948

1948 Syracuse (N.Y.) Herald-Jrnl. 30 June 10/1 The two chemists chose the name prometheum for Prometheus, the Titan in Greek mythology who stole fire from heaven for mankind's use.

1948 Marinsky & Glendenin in Chem. & Engin. News 9 Aug. 2348/2 We propose, therefore, the name ‘prometheum’ (symbol Pm) for element 61 after Prometheus,..who stole fire from heaven for the use of mankind... This name..symbolizes the dramatic way in which the element may be produced in quantity as a result of man's harnessing of the energy of nuclear fission.

1949 Sun (Baltimore) 22 Sept. 21/4 An element 500 times ‘hotter’ than radium is being studied... It is promethium, one of the rare earth metals.

1959 Seaborg & Valens Elements of Universe 126 Promethium nitrate is a rather undistinguished-looking powder.

1989 C. Caufield Multiple Exposures (1990) xx. 207 Promethium and tritium emit beta radiation which, unlike gamma, cannot penetrate glass dial-covers.

2003 Chem. Mater. 15 3966/1 To sustain phosphorescence, radioactive elements, such as radium.., tritium.., and promethium (¹⁴⁷Pm) were added to ZnS:Cu phosphor.

This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022).

单词	promethium
释义	promethiumn. Brit. /prəˈmiːθɪəm/, U.S. /proʊˈmiθiəm/ Forms: 1900s– prometheum, 1900s– promethium. Origin: From a proper name, combined with an English element. Etymons: proper name Prometheus , -ium suffix. Etymology: < the name of Prometheus (see Prometheus n.) + -ium suffix (see quot. 1948²). A rare, radioactive, metallic chemical element of the lanthanide series, atomic number 61, which was first produced artificially in a nuclear reactor and is present in trace amounts as a fission product in uranium ores. Symbol Pm. Cf. illinium n.The longest-lived isotope (promethium-145) has a half-life of about 18 years. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > promethium > [noun] illinium1926 florentium1927 promethium1948 1948 Syracuse (N.Y.) Herald-Jrnl. 30 June 10/1 The two chemists chose the name prometheum for Prometheus, the Titan in Greek mythology who stole fire from heaven for mankind's use. 1948 Marinsky & Glendenin in Chem. & Engin. News 9 Aug. 2348/2 We propose, therefore, the name ‘prometheum’ (symbol Pm) for element 61 after Prometheus,..who stole fire from heaven for the use of mankind... This name..symbolizes the dramatic way in which the element may be produced in quantity as a result of man's harnessing of the energy of nuclear fission. 1949 Sun (Baltimore) 22 Sept. 21/4 An element 500 times ‘hotter’ than radium is being studied... It is promethium, one of the rare earth metals. 1959 Seaborg & Valens Elements of Universe 126 Promethium nitrate is a rather undistinguished-looking powder. 1989 C. Caufield Multiple Exposures (1990) xx. 207 Promethium and tritium emit beta radiation which, unlike gamma, cannot penetrate glass dial-covers. 2003 Chem. Mater. 15 3966/1 To sustain phosphorescence, radioactive elements, such as radium.., tritium.., and promethium (¹⁴⁷Pm) were added to ZnS:Cu phosphor. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022). < n.1948
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