THE SPECTROGRAPHIC DETERMINATION OF URANIUM 235. PART III. USE OF A MULTIPLE HOLLOW CATHODE SOURCE ASSEMBLY AND A 22 FOOT DIRECT READING EAGLE SPECTROGRAPH
Journal Article
·
· Appl. Spectroscopy
Work done with a 22-ft Eagle mounted, direct-reading spectrograph using 5 in. of a 15000 lines/in. concave grating in the second order is described. Samples were excited in a multiple source assembly consisting of 4 hollow cathode source lamps and an automatically positioned selector mirror. This arrangement allowed close comparison of unknown and standard, minimized the effect of exit slit misalignment, and an allowed large number of routine samples to be handled economical. A complete analysis in duplicate, including comparison standards, was made in less than 20 min. Measurements on 4 standards having U/sup 235/ concentrations in the range of 10 to 51% showed average external and internal precisions of plus or minus 0.23 and plus or minus 0.048% U/sup 235/ for a single cathode determination. Analyses of 32 unknown samples containing 10 to 85% U/sup 235/ determined independently on the optical spectrograph and the mass spectrometer, showed good agreement. Comparative measurements on 65 unknown samples in the range of 30 to 40% U/sup 235/ showed an agreement of plus or minus 0.17% U/sup 235/ with no significant bias. All precisions were expressed at the 95% confidence level. The factor limiting the precision - a weak line interfering with the U/sup 235/ measurement, and the effect of U/sup 234/ and U/ sup 236/ on the analysis are disc ussed. (auth)
- Research Organization:
- Union Carbide Nuclear Co., Oak Ridge, Tenn.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-019318
- OSTI ID:
- 4004352
- Journal Information:
- Appl. Spectroscopy, Journal Name: Appl. Spectroscopy Vol. Vol: 15: No. 2
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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