11 Matching Results

Search Results

Advanced search parameters have been applied.


Description: This report covers studies of the excretion and retention of 'tracer' and toxic doses of the 11.2-day Ra{sup 223} isotope, its acute toxicity (organ weight changes, gross and microscopic pathology, and Fe{sup 59} utilization by the bone marrow), and long-term histopathological changes and alterations in the hemogram.
Date: February 21, 1958
Creator: Durbin, Patricia; Durbin, Patricia W.; Asling, C. Willet.; Jeung, Nylan; Williams, Marilyn H.; Post, James. et al.
Partner: UNT Libraries Government Documents Department


Description: Work was begun to determine the physical properties of mica-filled diallyl phthalate. Both the impact and tensile strength values compared favorably wlth asbestos-filled DAP formulatlons. The tensile values compared with the upper limit tensile strength values for asbestos-filled formulations. Adiprene-ferric acetyl acetonate-polyol systems were developed as adhesives and their properties studied. Sources of kilogram quantities of Th/sup 2//sup 3//sup 0/ were investigated. The samples were analyzed by a direct CeF/sub 3/ precipitation procedurc or by a tributyl phosphate-cerium procedure. The half- life of Ra/sup 2//sup 2//sup 3/ was found to be 11.3700 plus or minus 0.0065 days. Differential thermal analyses were made of lanthanum and praseodymium metals. Three preilminary determinations of the density of molten cerium were made by the vacuum pycnometer method. An average value of 6.58 was obtained. Leaching tests in water and in 0.1N HCl were continued on fibers of an experimental glass containing 10 wt.%n plutonium oxide. (M.C.G.)
Date: January 31, 1961
Creator: Eichelberger, J.F.
Partner: UNT Libraries Government Documents Department


Description: Using six hot-wire columns and three concentric tube thermal diffusion columns a cascade system was arranged to produce 0.04 g of 90% C/sup 13/ per day using methane as the feed gas-. The ten liter shipment of purchased methane enriched to 60% C/sup 13/ was received. This gas will be enriched to 90% C/slup 13/. Before removing the equilibrated gas from the concentric tube columns in preparation for using methane enriched in C/sup 13/ as feed material, a sample of methane taken from the bottom of the last column contained greater than 65% C/sup 13/. The hydrolysis of protactinium was found to be completely controllable and reversible and can serve as the basis for its separation from other elements, particularly its decay products. The tendency to hydrolyze is not a unlque characteristic of protactinium, but is exhibited, under appropriate conditions, by Th/sup 227/ and Ra/sup 223/ at trace levels. Traces of protactinium in 1N H/ sub 2/SO/sub 4/ can be removed from solution by a coarse glass wool filter through which the decay products pass readily. The reverse is true if the H/sub 2/SO/sub 4/ concentration is increased to 6N. The desorption of protactinium from platinum was a function of the reagent, the reagent concentration, and the amount of protactinium adsorbed. The relative solubility of protactinium in various reagents increased in the order: HNO/sub 3/ < HCl < H/sub 2/SO/sub 4/ < H/ sub 2/C/sub 2/O/sub 4/ < HF. Equations for computing the growth of the principal alpha-emitters in the Ac/sup 227/ decay chain were recalculated based on the recently redetermined half lives of Ac/sup 227/, Th/sup 227/, and Ra/sup 223/. Several laboratory experiments on waste disposal problems indicated that radioactivity levels in influent water can be significantly reduced by precipitating aluminum hydroxide as well as bismuth hydroxide in the ...
Date: March 30, 1963
Creator: Eichelberger, J.F.; Grove, G.R.; Jones, L.V. & Rembold, E.A.
Partner: UNT Libraries Government Documents Department


Description: In research on plastics, flow curve data were obtained on asbestos- filled diallyl phthalate formulations. The tensile properties of adhesive formulations after 26 weeks cure time are being tested. In development of radioelements, progress is reported in investigations of kinetics invoived in Po(IV) reduction by ferrous iron and selective adsorption of trace elements. Development of separating and purifying processes is reported for Xe, H/sub 2/, and C. Work on the Ranger x-ray sensor was devoted to fiim casting techniques and Be metallography and deposition. Developmental work in Pu-bearing fuels is reported on techniques for differential thermai analysis, interfacial tension studies on liquids, cerium viscosity, Pu phase studies, and Pu-bearing glass. Developmental work in support of SNAP was devoted to welding, capsule design, source metallography, and recovery of U . Calorimetric measurements related to Ra/sup 223/ half life are reported. Development of a program for reduction of spectrometric data is also reported. (J.R.D.)
Date: March 30, 1962
Creator: Eichelberger, J.F.
Partner: UNT Libraries Government Documents Department


Description: Adhesives. The effects obtained when diols and triols are used to cure Adiprene L-213 are discussed. Most of the formulations are very viscous and present difficulties in degassing operations. Ionium Project. Four plant samples having 1 ppm or more of Th/sup 2//sup 3//sup 0/ were analyzed for Th/sup 2//sup 3//sup 0/ in two different ways, one using HNO/sub 3/ digestion and the other using HClO/sub 4/ digestion. The difference between these two methods found for one sample is attributed to insolubility induced by calcining. Half Life of Radium-223. The decay of a purified Ra/sup 2//sup 2//sup 3/ sample was followed by alpha counting for 109 days; the results indicate that a long-lived impurity may be the cause of the nonconvergence of the probable error in the resolution time range. Purification of a composite sample containing Ac/sup 2// sup 2//sup 7/ to give a source of Ra/sup 2//sup 2//sup 3/ is described. Determination of Coincidence Correction. The coincidence correction was determined for a proportional alpha counter with Pb/sup 2//sup 1//sup 1/, and the best resolution times and half lives are given. Plutonium Alloy Research. The density of liquid Ce was measured from 825 to 1000 deg C with the vacuum pycnometer method; the thermal coefficient of cubical expansion is found to be very small, 33 x 10/sup -//sup 6/ cm/sup 3// cm/sup 3// deg C, and the volume change of fusion is also estimated to be small, less than 0.5%. The viscosities of molten La and Pr were determined from their melting points up to 996 deg C. Qualitative tests were made to study the wetting properties of Pu alloys on Ta. Pure liquid Pu did not wet Ta surfaces, but a Fu--43 at.% Co alloy had improved wetting properties. Plutonium-bearing Glass Fibers. Leaching tests were made at room temperature on ...
Date: March 30, 1961
Creator: Eichelberger, J.F.
Partner: UNT Libraries Government Documents Department