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Radiolytic gas generation in plutonium contaminated waste materials

Description: Many plutonium contaminated waste materials decompose into gaseous products because of exposure to alpha radiation. The gases generated (usually hydrogen) over long-storage periods may create hazardous conditions. To determine the extent of such hazards, knowing the gas generation yields is necessary. These yields were measured by contacting some common Rocky Flats Plant waste materials with plutonium and monitoring the enclosed atmospheres for extensive periods of time. The materials were Plexiglas, polyvinyl chloride, glove-box gloves, machining oil, carbon tetrachloride, chlorothene VG solvent, Kimwipes (dry and wet), polyethylene, Dowex-1 resin, and surgeon's gloves. Both /sup 239/Pu oxide and /sup 238/Pu oxide were used as radiation sources. The gas analyses were made by mass spectrometry and the results obtained were the total gas generation, the hydrogen generation, the oxygen consumption rate, and the gas composition over the entire storage period. Hydrogen was the major gas produced in most of the materials. The total gas yields varied from 0.71 to 16 cm/sup 3/ (standard temperature pressure) per day per curie of plutonium. The oxygen consumption rates varied from 0.0088 to 0.070 millimoles per day per gram of plutonium oxide-239 and from 0.0014 to 0.0051 millimoles per day per milligram /sup 238/Pu.
Date: October 29, 1976
Creator: Kazanjian, A. R.
Partner: UNT Libraries Government Documents Department

Radiation stability of a hydrogen getter material (DPPE). [Dimerized phenyl propargyl ether containing Pd on CaCO/sub 3/ catalyst]

Description: An investigation was made on a hydrogen getter material (DPPE) to determine its radiation stability. Such material has potential for nuclear industry applications. The material is composed of 75 percent of an unsaturated organic compound (1,6-diphenoxy-2,4-hexadiyne) and 25 percent catalyst (5 percent palladium on calcium carbonate). The radiation stability of this material and of the hydrogenated product was determined by exposing them to gamma radiation in air and vacuum and analyzing for radiolysis products and hydrogen capacity. The major products formed were phenol and carbon dioxide. Numerous solid compounds were also formed in much smaller yields. Product yields were much larger in air than in vacuum. Hydrogen uptake curves showed that the hydrogen capacity decreased appreciably after an absorbed dose of about 10/sup 8/ rads, and that irradiation is more detrimental in air than in vacuum. (For SI (metric) use: rads have been replaced by grays (Gy) and 1 gray = 1 joule per kilogram, and 10/sup 8/ rads = 1 megajoule per kilogram.)
Date: October 18, 1976
Creator: Kazanjian, A. R.
Partner: UNT Libraries Government Documents Department

Dissolution of plutonium oxide in nitric acid at high hydrofluoric acid concentrations

Description: The dissolution of plutonium dioxide in nitirc acid (HNO/sub 3/) at high hydrofluoric acid (HF) concentrations has been investigated. Dissolution rate curves were obtained using 12M HNO/sub 3/ and HF at concentrations varying from 0.05 to 1.0 molar. The dissolution rate increased with HF concentration up to 0.2M and then decreased at higher concentrations. There was very little plutonium dissolved at 0.7 and 1.0M HF because of the formation of insoluble PuF/sub 4/. Various oxidizing agents were added to 12M HNO/sub 3/-1M HF dissolvent to oxidize Pu(IV) to Pu(VI) and prevent the formation of PuF/sub 4/. Ceric (Ce(IV)) and silver (Ag(II)) ions were the most effective in dissolving PuO/sub 2/. Although these two oxidants greatly increased the dissolution rate, the rates were not as rapid as those obtained with 12M HNO/sub 3/-0.2M HF.
Date: June 15, 1984
Creator: Kazanjian, A.R. & Stevens, J.R.
Partner: UNT Libraries Government Documents Department

Gas generation results and venting study for transuranic waste drums

Description: Sixteen waste drums, containing six categories of plutonium-contaminated waste, were monitored for venting and gas generation for six months. The venting devices tested appeared adequate to relieve pressure and prevent hydrogen accumulation. Most of the gas generation, primarily H2 and CO2, was due to radiolytic decomposition of the hydrogenous wastes. Comparison of the gas yields with those obtained previously in laboratory tests showed very reasonable agreement with few exceptions.
Date: September 23, 1985
Creator: Kazanjian, A.R.; Arnold, P.M.; Simmons, W.C. & D'Amico, E.L.
Partner: UNT Libraries Government Documents Department