11 Matching Results

Search Results

Advanced search parameters have been applied.

Recovery and Purification of Technetium-99 From Neutralized Purex Wastes

Description: Technetium recovery from neutralized Purex waste supernate by ion exchange was studied on laboratory and pilot plant scales. The pertechnetate ion was shown to be absorbed from slightly acid, neutral, or basic solutions at concentrations as high as 7.5 M in nitrate by a variety of strong-base anion exchange resins. Several grams of Tc were recovered from plant waste supernate in three runs using a single five liter anion exchange bed. The recovered Tc was further purified by oxidation of Ru to RuO/sub 4/ and precipitation of the Ru on a cation exchange bed to give a Tc product of high purity. The Tc was subsequently precipitated as technetium sulfide. The results obtained show that Tc can be economically recovered from neutralized Purex wastes by a single stage ion exchange process with over-all yields greater than 80%. the Tc can be obtained with a chemical and radiochemical purity greater than 99%. (auth)
Date: May 1, 1962
Creator: Roberts, F. P.; Smith, F. M. & Wheelwright, E. J.
Partner: UNT Libraries Government Documents Department

Range Energy Relation for Protons in Nuclear Emulsions

Description: An experimental range-energy relation in Ilford C-2 emulsion has been obtained for proteins up to 39.5 Mev. In the region from 17 to 33 Mev the relation for dry emulsion is fitted by the empirical equation E{sub (MeV)} = 0.251 R{sub ({mu})} 0.581. Variations in water content due to changes in atmospheric humidity make several percent difference in range. The range in Ilford glass is found to be 18 {+-} 4 percent longer than in dry C-2 emulsion.
Date: September 9, 1949
Creator: Bradner, H.; Smith, F.M.; Barkas, W.H. & Bishop, A.S.
Partner: UNT Libraries Government Documents Department

Method for welding beryllium

Description: A method is provided for joining beryllium pieces which comprises: depositing aluminum alloy on at least one beryllium surface; contacting that beryllium surface with at least one other beryllium surface; and welding the aluminum alloy coated beryllium surfaces together. The aluminum alloy may be deposited on the beryllium using gas metal arc welding. The aluminum alloy coated beryllium surfaces may be subjected to elevated temperatures and pressures to reduce porosity before welding the pieces together. The aluminum alloy coated beryllium surfaces may be machined into a desired welding joint configuration before welding. The beryllium may be an alloy of beryllium or a beryllium compound. The aluminum alloy may comprise aluminum and silicon. Beryllium parts made using this method can be used as structural components in aircraft, satellites and space applications.
Date: December 31, 1995
Creator: Dixon, R.D.; Smith, F.M. & O`Leary, R.F.
Partner: UNT Libraries Government Documents Department


Description: In seven production runs, 75,000 curies of Sr/sup 90/ were isolated and purified in the ion-exchange equipment of Hanford Laboratories High Level Cells. The production goal (60,000 curies of purified Sr/sup 90/) and the time schedule were met or exceeded and the product exceeded the customer's purity requirements. The hot-cell-purified strontium made possible the completion on time of the Weather Bureau power source and the Martin 10 watt SNAP VII-A and VIl-C units. The isotopic purity of the strontium product was 56% Sr/sup 90/. The chemical purity was greater than 95% strontium. The Zr-Nb/sup 95/ contamination of the product was less than 5 x 10/sup -5/ curies per curie of Sr/sup 90/, and the Ce- Pr contamination was less than 1 x 10/sup -5/ curies per curie of Sr/sup 90/. The final run yielded 16,500 curies of Sr/sup 90/ in an eight liter product solution. The product was >98% strontium and contained less than one curie of Zr- Nb/sup 90/ or Ce-Pr/sup 144/. Eleven days of continuous operation were required to complete the run. (auth)
Date: September 1, 1961
Creator: Bray, L.A.; Lust, L.F.; Moore, R.L.; Roberts, F.P.; Smith, F.M.; Van Tuyl, H.H. et al.
Partner: UNT Libraries Government Documents Department

Hyperon and Negative K-Meson Masses

Description: The following report studies the interactions of K-mesons in nuclear track emulsions and measures range-energy.
Date: September 1957
Creator: Barkas, W. H.; Giles, P. C.; Heckman, Harry H.; Inman, Fred W.; Mason, C. J. & Smith, F. M.
Partner: UNT Libraries Government Documents Department

Combined in-situ dilatometer and contact angle studies of interfacial reaction kinetics in brazing.

Description: Multi-component dissimilar material braze joints as shown in Figure 1 consisting of dissimilar base materials, filler materials and wetting agents are of tantamount importance in a wide variely of applications. This work combines dilatometry and contact angle measurements to characterize in-situ the multiple interfacial reaction pathways that occur in such systems. Whereas both of these methods are commonly used tools in metallurgical investigation, their combined use within the context of brazing studies is new and offers considerable additional insight. Applications are discussed to joints made between Beryllium and Monel with TiH{sub 2} as the wetting agent and Cu-28%Ag as the filler material.
Date: January 1, 2001
Creator: Dave, V. R. (Vivek R.); Javernick, D. A. (Daniel A.); Thoma, D. J. (Dan J.); Cola, M. J. (Mark J.); Hollis, K. J. (Kendall J.); Smith, F. M. (Frank M.) et al.
Partner: UNT Libraries Government Documents Department

Cathodic ARC surface cleaning prior to brazing

Description: Surface cleanliness is one the critical process variables in vacuum furnace brazing operations. For a large number of metallic components, cleaning is usually accomplished either by water-based alkali cleaning, but may also involve acid etching or solvent cleaning / rinsing. Nickel plating may also be necessary to ensure proper wetting. All of these cleaning or plating technologies have associated waste disposal issues, and this article explores an alternative cleaning process that generates minimal waste. Cathodic arc, or reserve polarity, is well known for welding of materials with tenacious oxide layers such as aluminum alloys. In this work the reverse polarity effect is used to clean austenitic stainless steel substrates prior to brazing with Ag-28%Cu. This cleaning process is compared to acid pickling and is shown to produce similar wetting behavior as measured by dynamic contact angle experiments. Additionally, dynamic contact angle measurements with water drops are conducted to show that cathodic arc cleaning can remove organic contaminants as well. The process does have its limitations however, and alloys with high titanium and aluminum content such as nickel-based superalloys may still require plating to ensure adequate wetting.
Date: January 1, 2002
Creator: Dave, V. R. (Vivek R.); Hollis, K. J. (Kendall J.); Castro, R. G. (Richard G.); Smith, F. M. (Frank M.) & Javernick, D. A. (Daniel A.)
Partner: UNT Libraries Government Documents Department

The Antiproton-Nucleon Annihilation Process (AntiprotonCollaboration Experiment)

Description: In the exposure to a 7 0 0-MeV/c negative particle beam, 35 antiproton stars have been found. Of these antiprotons, 21 annihilate in flight and three give large-angle scatters ( {Theta} > 15 , T{sub P-} > 50 Mev), while 14 annihilate at rest. From the interactions in flight we obtain the total c r o s s section for antiproton interaction
Date: September 10, 1956
Creator: Barkas, W.H.; Birge, R.W.; Chupp, W.W.; Ekspong, A.G.; Goldhaber,G.; Goldhaber, S. et al.
Partner: UNT Libraries Government Documents Department