232Th, 233Pa, and 234U capture cross-section measurements in moderated neutron flux
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| Title: | 232Th, 233Pa, and 234U capture cross-section measurements in moderated neutron flux |
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| Authors: | Bringer, O.1, Isnard, H.2, AlMahamid, I.3, Chartier, F.2, Letourneau, A.1 aletourneau@cea.fr |
| Source: | Nuclear Instruments & Methods in Physics Research Section A. Jul2008, Vol. 591 Issue 3, p510-516. 7p. |
| Subjects: | Neutrons, Fused salts, Mass spectrometry, Irradiation |
| Abstract: | Abstract: The Th–U cycle was studied through the evolution of a 100μg 232Th sample irradiated in a moderated neutron flux of 8.01014 n/cm2/s, intensity close to that of a thermal molten salt reactor. After 43 days of irradiation and 6 months of cooling, a precise mass spectrometric analysis, using both TIMS and MC-ICP-MS techniques, was performed, according to a rigorous methodology. The measured thorium and uranium isotopic ratios in the final irradiated sample were then compared with integral simulations based on evaluated data; an overall good agreement was seen. Four important thermal neutron-capture cross-sections were also extracted from the measurements, 232Th (7.34±0.21b), 233Pa (38.34±1.78b), 234U (106.12±3.34b), and 235U (98.15±11.24b). Our 232Th and 235U results confirmed existing values whereas the cross-sections of 233Pa and 234U (both key parameters) have been redefined. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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