Instrumental neutron activation analysis in the determination of the $sup 235$U/$sup 238$U isotopic ratios for samples from 0.4 to 93% $sup 235$U
Book
·
OSTI ID:4345944
A simple neutron activation method for the determination of the /sup 235/ U/sup 238/U isotopic ratios using a high-resolution Ge(Li) detector for gamma detection is reported. The /sup 235/U//sup 238/U ratios are determined from the activity ratios of /sup 143/Ce//sup 239/Np. The 293- and 278keV gamma rays from / sup 143/Ce and /sup 239/Np, respectively, were chosen for their activity measurements. With well thermalized neutrons the isotopic ratios can be determined for samples with /sup 235/U contents from 0.4 to about 30%. The accuracy is about 2 to 3% for samples with /sup 235/U contents below about 10%. With increasing /sup 235/U contents the accuracy decreases because the relative intensity of the 278-keV gamma ray of /sup 239/Np becomes too weak to be determined accurately. For samples of high /sup 235/U content, epithermal neutrons must be used in the activation to enhance the relative production rate of /sup 239/Np with respect to that of fission products. The epithermal neutrons are obtained by means of cadmium filters. With samples well shielded by cadmium filters, i.e. inside a closed cadmium case, the enhancement of the relative production rate of /sup 239/Np to that of /sup 143/Ce is found to be about 80 fold compared with the activation of well thermalized neutrons. (GE)
- Research Organization:
- Inst. of Nuclear Energy Research, Taipei, Taiwan
- NSA Number:
- NSA-29-015238
- OSTI ID:
- 4345944
- Country of Publication:
- Germany
- Language:
- English
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Conference
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Sun Dec 31 23:00:00 EST 1978
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OSTI ID:5788950
EXCITATION FUNCTIONS OF U$sup 235$ AND U$sup 238$ BOMBARDED WITH HELIUM AND DEUTERIUM IONS
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Tue Mar 31 23:00:00 EST 1959
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
·
OSTI ID:4270845
The fission cross sections of /sup 230/Th, /sup 232/Th, /sup 233/U, /sup 234/U, /sup 236/U, /sup 238/U, /sup 237/Np, /sup 239/Pu and /sup 242/Pu relative /sup 235/U at 14. 74 MeV neutron energy
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·
Sun Nov 30 23:00:00 EST 1986
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OSTI ID:6769505
Related Subjects
*NEUTRON ACTIVATION ANALYZERS-- DESIGN
*URANIUM 235-- ACTIVATION ANALYSIS
*URANIUM 238-- ACTIVATION ANALYSIS
CERIUM 143
ERRORS
GAMMA SPECTROSCOPY
ISOTOPE RATIO
LI-DRIFTED GE DETECTORS
N40110* --Chemistry--Analytical & Separations Chemistry-- Activation & Nuclear Reaction Procedures
NEPTUNIUM 239
NEUTRON REACTIONS
SENSITIVITY
*URANIUM 235-- ACTIVATION ANALYSIS
*URANIUM 238-- ACTIVATION ANALYSIS
CERIUM 143
ERRORS
GAMMA SPECTROSCOPY
ISOTOPE RATIO
LI-DRIFTED GE DETECTORS
N40110* --Chemistry--Analytical & Separations Chemistry-- Activation & Nuclear Reaction Procedures
NEPTUNIUM 239
NEUTRON REACTIONS
SENSITIVITY