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LMFR Progress Letter for February 1954

Description: In a third run with the fluorine torch, the settling chamber wells were kept hotter than before (≥ 625°C); the flame was cooled by diluting the fluorine with helium. In the analysis of the products, 99% of the thorium fluoride fed in was accounted for, but only 64% of the protactinium activity. Part of this was carried in the exhaust gases past the cold trap and into the soda line disposal column, where it was detected by survey meters. The stripping of protactinium from the solid was somewhat … more
Date: March 10, 1954
Creator: Miles, F. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Peak Stripping Methodology for Plutonium Analysis in the Presence of Neptunium

Description: Quantitative Plutonium analysis depends upon the accurate identification of the assay peak. The Np[Pa] equilibrium pair introduces interfering peaks in {sup 239}Pu, {sup 238}Pu, and {sup 235}U assay peak region. When an interfering peak is present, it negates the assay unless an appropriate technique can be developed to deal with the interference. Peak Stripping is one such technique. Peak stripping involves an algorithm to strip an entire peak from another, resulting in a spectrum that can the… more
Date: May 17, 2005
Creator: Hodge, Christ
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Influence of 5f electrons on structure and bonding in the actinide-hydrogen intermetallics

Description: Complexa phases form for the Th + H and U + H systems that are found with no other metals. In the Pa + H system, simple bcc C15 Laves and A15 phases can form, dependent on temperature and composition. The phase transformations appear to b magnetically driven, as a resutl of the decoupling of the metallic 5f electron bonding that occurs during hydriding; the C15 phases contain two kinds of Pa atoms-the one sublattice being still fully f-bonded and the other magnetic. This is a unique situation i… more
Date: January 1, 1984
Creator: Ward, J.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Reflection asymmetry in odd-A and odd-odd actinium nuclei

Description: Theoretical calculations and measurements indicate that octupole correlations are at a maximum in the ground states of the odd-proton nuclei Ac and Pa. It has been expected that odd-odd nuclei should have even larger amount of octupole-octupole correlations. We have recently made measurements on the structure of {sup 224}Ac. Although spin and parity assignments could not be made, two bands starting at 354.1 and 360.0 keV have properties characteristic of reflection asymmetric shape. These two b… more
Date: September 1, 1993
Creator: Ahmad, I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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LMFR Progress Letter for April 1954

Description: Summary of miscellaneous updates related to the project. This includes information on the following. Simplified equations for modeling reactor conditions. Solubility tests involving thorium, bismuth, and protactinium. various other measurements and tests involving thorium, uranium, protactinium, bismuth, aluminum, and various other salts.
Date: May 21, 1954
Creator: Miles, F. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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LMFR Progress Letter for March 1954

Description: Summary of miscellaneous updates related to the project. This includes information on the following: the declassification of a relevant paper, solubility measurements, static corrosion tests, various other tests involving bismuth, magnesium, uranium, protactinium, and thorium.
Date: April 15, 1954
Creator: Miles, F. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Determination of HRE-3 Breeding Ratio

Description: The accuracy with which the breeding ratio of HRE-3 could be determined after a period of reactor operation was investigated. Inaccuracies in measurement of the core U/sup 233/ inventory and blanket U/sup 233/ and Pa/sup 233/ inventories appear to be the major sources of error. Appreciable errors could result from attempting to determine these inventories by sampling the reactor contents. For example, if generalized attack on stainless steel is at a rate of 1.0 mpy and if the associated film of… more
Date: May 27, 1958
Creator: Rosenthal, M.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Procedures for the Separation of Products Resulting From Bombardment of Heavy Elements

Description: Technical report that attempts to bring together the various chemical procedures which proved most useful in studying the results of cyclotron bombardment or small scale neutron bombardments of heavy element targets. The report is limited to the elements of the "actinide", or second rare earth series, starting with thorium and including the newly discovered elements of atomic number 95 and 96. Every attempt is made to include all details necessary so this report can serve as a practical labora… more
Date: September 23, 1946
Creator: Thompson, Roy
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Spectroscopic and magnetic studies of tetravalent Pa and trivalent Th compounds

Description: At the beginning of the actinide series, the 5f and 6d configurations are very close in energy. Consequently, both the 5f and 6d energy level splittings may be observed experimentally in Pa{sup 4+} and Th{sup 3+} compounds. The available magnetic and optical data on these systems are reviewed.
Date: June 1, 1992
Creator: Edelstein, N. M. & Kot, W. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Recent Developments in Thorium Fuel Processing

Description: The following report summarizes the information on a year-long development of thorium fuel processing studies that took place at Oak Ridge National Laboratory.
Date: January 1, 1966
Creator: Nicholson, E. L.; Ferris, L. M.; Flanary, J. R.; Goode, J. H.; Hannaford, B. A.; Landry, J. W. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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PREDICTED SLURRY ACTIVATION IN HRE-3

Description: The gamma and beta activity of the proposed HRE-3 slurry for blanket operation at 10 Mw has been estimated. The sources of activity were found to be fission-product decay and Pa/sup 233/ decay. The estimated gamma activity of the slurry is plotted, showing the Pa/sup 233/ gammas, four energy groups of fission products, and the total gamma activity for a nearly infinite irradiation time. For the same conditions, the estimated beta activity of the slurry is plotted, showing the Pa/sup 233/ betas,… more
Date: February 1, 1958
Creator: Gift, E.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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NEUTRON LOSSES TO Pa$sup 233$ IN THE AQUEOUS HOMOGENEOUS BREEDER REACTOR

Description: Neutron losses to Pa/sup 2//sup 3//sup 3/ in the blanket of the AHBR were computed and compared for two cases: (1) concentration of Pa/sup 2//sup 3// sup 3/ is maintained uniform by continuous mixing, and (2) batches of fertile material are shifted periodically from high- to low-flux regions of blanket. It was found that, if the fertile material is cycled through three radial positions in three days, the loss of neutrons to Pa/sup 2//sup 3//sup 3/ is no more than one per cent greater than if it… more
Date: April 26, 1961
Creator: Miller, J.W. & Alexander, L.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High resolution measurement of the /sup 231/Pa(n,f) cross section from 0. 4 eV to 12 MeV

Description: The /sup 231/Pa(n,f) reaction was studied to shed light on the existence of a shallow third minimum in the /sup 232/Pa fission barrier. Results are plotted along with data points derived from ENDF/B-V. The occurrence of a pure vibrational state at E/sub n/ = 156.7 keV (3/sup +/) together with a nearby state of opposite parity favors the evidence for a third asymmetrically deformed minimum in the /sup 232/Pa fission barrier. 2 figures. (RWR)
Date: January 1, 1980
Creator: Plattard, S.; Auchampaugh, G. F. & de Saussure, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electronic Structure of the Heaviest Elements

Description: All of the available evidence leads to the view that the 5f electron shell is being filled in the heaviest elements giving rise to a transition series which begins with actinium in the same sense that the rare earth or 'lanthanide' series begins with lanthanum. Such an 'actinide' series is suggested on the basis of evidence in the following lines: (1) chemical properties, (2) absorption spectra in aqueous solution and crystals, (3) crystallographic structure data, (4) magnetic susceptibility da… more
Date: July 14, 1948
Creator: Seaborg, G. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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TOWARD AN IMPROVED UNDERSTANDING OF STRUCTURE AND MAGNETISM IN NEPTUNIUM AND PLUTONIUM PHOSPHONATES AND SULFONATES

Description: This grant supported the exploratory synthesis of new actinide materials with all of the actinides from thorium to californium with the exceptions of protactinium and berkelium. We developed detailed structure-property relationships that allowed for the identification of novel materials with selective ion-exchange, selective oxidation, and long-range magnetic ordering. We found novel bonding motifs and identified periodic trends across the actinide series. We identified structural building unit… more
Date: March 1, 2012
Creator: Albrecht-Schmitt, Thomas
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
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