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- W67102313 abstract "Work performed under United States - German High Temperature Reactor Reactor Research Exchange Program. A method was developed for determining U traces in pyrocarbon layers in the range 10/sup -6/ to 10/sup -9/. First, the layers are mechanically removed stepwise in special glass containers (step width 5 to 15 mu m) in which the chemical dissolution of the abraded PyC is carried out. The U is then determined by a fluorimetric method, with a relative standard deviation of 34% for 10/sup -9/ g 6% for 10/sup -7/ g and 9% for 10/sup -6/ g of uranium. The limit of detection is 10/sup -9/ g U. Impurities such as thorium, silicic acid, H/sub 2/SO/sub 4/ coming from the particles or the preparation of the solution do not disturb the uranium determination. For all particles investigated, a more or less distinct tub-shaped profile was observed with a maximum near the surface of the outer layers. The concentration level within the coating depends on the coating temperature. The contamination is about one order of magnitude higher for particles whose outer layer was deposited at 2000 deg C than for those coated below 1600 deg C. (17 figures, 36 references, 6 tables) (DLC)" @default.
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- W67102313 date "1971-06-01" @default.
- W67102313 modified "2023-09-24" @default.
- W67102313 title "Determination of uranium concentration profiles in the pyrocarbon of coated nucear fuel particles" @default.
- W67102313 hasPublicationYear "1971" @default.
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