THE NATURAL ABUNDANCES OF THE URANIUM ISOTOPES

1956 ◽  
Vol 34 (3) ◽  
pp. 259-264 ◽  
Author(s):  
M. Lounsbury
Keyword(s):  
Mass Spectrometer ◽  
Abundance Ratio ◽  
Uranium Isotopes ◽  
Surface Ionization ◽  
Ionization Mass ◽  
Bear Lake ◽  
Best Value ◽  
Isotopic Abundances

Using a surface-ionization mass spectrometer, the natural U238/U235 abundance ratio in uranium obtained from Great Bear Lake Pitchblende has been measured to be 137.80 ± 0.14. From a survey of results reported in the literature on U234 a best value of 17,325 ± 550 was estimated for the natural U238/U234 abundance ratio. The corresponding isotopic abundances are 0.7204 ± 0.0007 atom % and 0.00573 ± 0.00018 atom % for U235 and U234, respectively.

Surface Ionization Mass Spectrometer for Production Control

1957 ◽  
Vol 29 (11) ◽  
pp. 1593-1595 ◽  
Author(s):  
M. W. Echo ◽  
T. D. Morgan
Keyword(s):  
Mass Spectrometer ◽  
Production Control ◽  
Surface Ionization ◽  
Ionization Mass

Sequential Sample Changer for Surface-Ionization Mass Spectrometer

1966 ◽  
Vol 20 (1) ◽  
pp. 40-43 ◽  
Author(s):  
M. D. Lubin ◽  
K. O. Hamby ◽  
K. D. Rosenlof ◽  
E. Gieszelmann
Keyword(s):  
Mass Spectrometer ◽  
Surface Ionization ◽  
Ionization Mass ◽  
Sample Changer ◽  
Sequential Sample

A three-station sequential sample changer has been built for a surface-ionization mass spectrometer used in the analysis of nanogram-sized samples. During the analysis of a sample, the previously analyzed sample is replaced and the next sample to be analyzed is preheated. The delay between completion of one analysis and start of the next is reduced to 1 min or less.

scholarly journals Isotopic Composition of Lithium in Carbonaceous Chondrites Measured by a Modified Type Surface Ionization Mass Spectrometer.

2000 ◽  
Vol 48 (4) ◽  
pp. 275-283 ◽  
Author(s):  
Tomoe HATAKEYAMA ◽  
Keiji HISAYOSHI ◽  
Mamoru MURATA ◽  
Hiroaki OZAWA ◽  
Takeshi KOZAI ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Mass Spectrometer ◽  
Surface Ionization ◽  
Ionization Mass ◽  
Carbonaceous Chondrites
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