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Method For Fabricating Sup 99 Mo Production Targets Using Low Enriched Uranium Sup 99 Mo Production Targets Comprising Low Enriched Uranium
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Book Synopsis Method for Fabricating .sup. 99 Mo Production Targets Using Low Enriched Uranium, .sup. 99 Mo Production Targets Comprising Low Enriched Uranium by :
Download or read book Method for Fabricating .sup. 99 Mo Production Targets Using Low Enriched Uranium, .sup. 99 Mo Production Targets Comprising Low Enriched Uranium written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A radioisotope production target and a method for fabricating a radioisotope production target is provided, wherein the target comprises an inner cylinder, a foil of fissionable material circumferentially contacting the outer surface of the inner cylinder, and an outer hollow cylinder adapted to receive the substantially foil-covered inner cylinder and compress tightly against the foil to provide good mechanical contact therewith. The method for fabricating a primary target for the production of fission products comprises preparing a first substrate to receive a foil of fissionable material so as to allow for later removal of the foil from the first substrate, preparing a second substrate to receive the foil so as to allow for later removal of the foil from the second substrate; attaching the first substrate to the second substrate such that the foil is sandwiched between the first substrate and second substrate to prevent foil exposure to ambient atmosphere, and compressing the exposed surfaces of the first and second substrate to assure snug mechanical contact between the foil, the first substrate and the second substrate.
Book Synopsis Method for Fabricating 99Mo Production Targets Using Low Enriched Uranium, 99Mo Production Targets Comprising Low Enriched Uranium by : Thomas C. Weincek
Download or read book Method for Fabricating 99Mo Production Targets Using Low Enriched Uranium, 99Mo Production Targets Comprising Low Enriched Uranium written by Thomas C. Weincek and published by . This book was released on 199? with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Method for Fabricating 99Mo Production Targets Using Low Enriched Uranium, 99Mo Production Targets Comprising Low Enriched Uranium by :
Download or read book Method for Fabricating 99Mo Production Targets Using Low Enriched Uranium, 99Mo Production Targets Comprising Low Enriched Uranium written by and published by . This book was released on 1993 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: A radioisotope production target and a method for fabricating a radioisotope production target is provided, wherein the target comprises an inner cylinder, a foil of fissionable material (low enriched U) circumferentially contacting the outer surface of the inner cylinder, and an outer hollow cylinder adapted to receive the substantially foil-covered inner cylinder and compress tightly against the foil to provide good mechanical contact therewith. The method for fabricating a primary target for the production of fission products comprises preparing a first substrate to receive a foil of fissionable material so as to allow for later removal of the foil from the first substrate, preparing a second substrate to receive the foil so as to allow for later removal of the foil from the second substrate; attaching the first substrate to the second substrate such that the foil is sandwiched between the first substrate and second substrate to prevent foil exposure to ambient atmosphere, and compressing the exposed surfaces of the first and second substrate to assure snug mechanical contact between the foil, the first substrate and the second substrate.
Book Synopsis Processing of LEU Targets For[sup 99]Mo Production -- Demonstration of a Modified Cintichem Process by :
Download or read book Processing of LEU Targets For[sup 99]Mo Production -- Demonstration of a Modified Cintichem Process written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two demonstrations of the use of the Cintichem process on simulated low enriched uranium (LEU,
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Continuing Investigations for Technology Assessment of 99Mo Production from LEU (low Enriched Uranium) Targets by :
Download or read book Continuing Investigations for Technology Assessment of 99Mo Production from LEU (low Enriched Uranium) Targets written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently much of the world's supply of /sup 99m/Tc for medical purposes is produced from 99Mo derived from the fissioning of high enriched uranium (HEU). The need for /sup 99m/Tc is continuing to grow, especially in developing countries, where needs and national priorities call for internal production of 99Mo. This paper presents the results of our continuing studies on the effects of substituting low enriched Uranium (LEU) for HEU in targets for the production of fission product 99Mo. Improvements in the electrodeposition of thin films of uranium metal are reported. These improvements continue to increase the appeal for the substitution of LEU metal for HEU oxide films in cylindrical targets. The process is effective for targets fabricated from stainless steel or hastaloy. A cost estimate for setting up the necessary equipment to electrodeposit uranium metal on cylindrical targets is reported. Further investigations on the effect of LEU substitution on processing of these targets are also reported. Substitution of uranium silicides for the uranium-aluminum alloy or uranium aluminide dispersed fuel used in other current target designs will allow the substitution of LEU for HEU in these targets with equivalent 99Mo-yield per target and no change in target geometries. However, this substitution will require modifications in current processing steps due to (1) the insolubility of uranium silicides in alkaline solutions and (2) the presence of significant quantities of silicate in solution. Results to date suggest that both concerns can be handled and that substitution of LEU for HEU can be achieved.
Book Synopsis Development of Uranium Metal Targets for 99Mo Production by :
Download or read book Development of Uranium Metal Targets for 99Mo Production written by and published by . This book was released on 1993 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: A substantial amount of high enriched uranium (HEU) is used for the production of medical-grade 99Mo. Promising methods of producing irradiation targets are being developed and may lead to the reduction or elimination of this HEU use. To substitute low enriched uranium (LEU) for HEU in the production of 99Mo, the target material may be changed to uranium metal foil. Methods of fabrication are being developed to simplify assembly and disassembly of the targets. Removal of the uranium foil after irradiation without dissolution of the cladding is a primary goal in order to reduce the amount of liquid radioactive waste material produced in the process. Proof-of-concept targets have been fabricated. Destructive testing indicates that acceptable contact between the uranium foil and the cladding can be achieved. Thermal annealing tests, which simulate the cladding/uranium diffusion conditions during irradiation, are underway. Plans are being made to irradiate test targets.
Book Synopsis Processing of LEU Targets For[sup 99]Mo Production--testing and Modification of the Cintichem Process by :
Download or read book Processing of LEU Targets For[sup 99]Mo Production--testing and Modification of the Cintichem Process written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experimental results on testing and modification of the Cintichem process to allow substitution of low enriched uranium (LEU) for high enriched uranium (HEU) targets are presented in this report. The main focus is on[sup 99]Mo recovery and purification by its precipitation with[alpha]-benzoin oxime. Parameters that were studied include concentrations of nitric and sulfuric acids, partial neutralization of the acids, molybdenum and uranium concentrations, and the ratio of[alpha]-benzoin oxime to molybdenum. Decontamination factors for uranium, neptunium, and various fission products were measured. Experiments with tracer levels of irradiated LEU were conducted for testing the[sup 99]Mo recovery and purification during each step of the Cintichem process. Improving the process with additional processing steps was also attempted. The results indicate that the conversion of molybdenum chemical processing from HEU to LEU targets is possible.
Book Synopsis Processing of LEU Targets for 99Mo Production -- Demonstration of a Modified Cintichem Process by :
Download or read book Processing of LEU Targets for 99Mo Production -- Demonstration of a Modified Cintichem Process written by and published by . This book was released on 1995 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two demonstrations of the use of the Cintichem process on simulated low enriched uranium (LEU,
Book Synopsis Full-scale Demonstration of the Cintichem Process for the Production of Mo-99 Using a Low-enriched Target by :
Download or read book Full-scale Demonstration of the Cintichem Process for the Production of Mo-99 Using a Low-enriched Target written by and published by . This book was released on 1998 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The irradiation, disassembly, and processing of two full-scale low-enriched uranium (LEU) targets were recently demonstrated by personnel in the BATAN PUSPIPTEK Facilities (Serpong, Indonesia). Targets were fabricated at Argonne National Laboratory (Argonne, IL, U.S.A.) and shipped to PUSPIPTEK. The processing was done by nearly the same procedure used for the production of 99Mo from high-enriched uranium (HEU) targets. The BATAN Radioisotope Production Centre produces 99Mo using the Cintichem process by first dissolving the uranium in an acid cocktail; three proprietary separation steps recover the 99Mo and purify it from other components of the irradiated uranium. Processing of LEU-metal targets is nearly identical to that used for HEU-oxide targets except (1) a separate dissolver is required and (2) the dissolution cocktail is nitric acid alone rather than a nitric/sulfuric acid mixture. The demonstrations went smoothly except for problems with sampling and gamma analysis to assess product purity. Foils could be removed from targets fabricated from zirconium and/or 304 stainless steel, and processing produced an equivalent yield of 99Mo/235U to that of the HEU target.
Book Synopsis Processing of LEU Targets for 99Mo Production -- Dissolution of Metal Foils by Nitric-acid by :
Download or read book Processing of LEU Targets for 99Mo Production -- Dissolution of Metal Foils by Nitric-acid written by and published by . This book was released on 1995 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first step in processing low-enriched uranium (LEU) targets for production of 99Mo is to dissolve the neutron-irradiated uranium foil coming from the reactor. Appropriate conditions for dissolving the foils were determined by measuring the dissolution rates for uranium foil over a wide range of temperatures and acid concentrations. On the basis of these dissolution rates, the process chemistry, and a model that integrates dissolution rates as a function of temperature and composition, a closed stainless-steel dissolver was designed, built, and tested for dissolving up to 18 g of uranium foil. The results were quite successful, with the uranium foil being dissolved within one hour as desired. To do this, the dissolver temperature must be in the range from 97 to 102 C, and the dissolver solution (cocktail) must have a composition of 3M nitric acid and 2M sulfuric acid. The final dissolver solution is subsequently processed to separate 99Mo from uranium, fission products, and other elements.
Book Synopsis Processing of LEU Targets for 99Mo Production--testing and Modification of the Cintichem Process by :
Download or read book Processing of LEU Targets for 99Mo Production--testing and Modification of the Cintichem Process written by and published by . This book was released on 1995 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experimental results on testing and modification of the Cintichem process to allow substitution of low enriched uranium (LEU) for high enriched uranium (HEU) targets are presented in this report. The main focus is on 99Mo recovery and purification by its precipitation with [alpha]-benzoin oxime. Parameters that were studied include concentrations of nitric and sulfuric acids, partial neutralization of the acids, molybdenum and uranium concentrations, and the ratio of [alpha]-benzoin oxime to molybdenum. Decontamination factors for uranium, neptunium, and various fission products were measured. Experiments with tracer levels of irradiated LEU were conducted for testing the 99Mo recovery and purification during each step of the Cintichem process. Improving the process with additional processing steps was also attempted. The results indicate that the conversion of molybdenum chemical processing from HEU to LEU targets is possible.
Book Synopsis Thermal-mechanical Analysis of a Low-enriched Uranium Foil Based Annular Target for the Production of Molybdenum-99 by : Srisharan Garg Govindarajan
Download or read book Thermal-mechanical Analysis of a Low-enriched Uranium Foil Based Annular Target for the Production of Molybdenum-99 written by Srisharan Garg Govindarajan and published by . This book was released on 2011 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the US department of Energy's global threat reduction initiative goals is to eliminate the use of high-enriched uranium from the production of the radio-isotope Molybdenum-99. One strategy to achieve this goal is to use a target that utilizes a low-enriched uranium (LEU) foil. This thesis considers an annular target, where an LEU foil of open cross section is sandwiched between two concentric aluminum tubes. The target must contain the fission products until it can be opened and the LEU foil removed for further processing. The thermal contact resistance between the LEU foil and the aluminum tube cladding needs to be low enough to ensure that the LEU temperature doesn't exceed the operating temperature specified by the reactor safety case. Numerical and analytical models were used to analyze the behavior of the target and it is found that the current annular target design is safe at high LEU heat generation rates.
Download or read book Physics Briefs written by and published by . This book was released on 1988 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Production of MO-99 Using Low-enriched Uranium Silicide by :
Download or read book Production of MO-99 Using Low-enriched Uranium Silicide written by and published by . This book was released on 1994 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Processing of LEU Targets for 99Mo Production -- Dissolution of Metal Foil Targets by Alkaline Hydrogen Peroxide by :
Download or read book Processing of LEU Targets for 99Mo Production -- Dissolution of Metal Foil Targets by Alkaline Hydrogen Peroxide written by and published by . This book was released on 1995 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: In FY 1995, the authors started studies on a new process for dissolution of low-enriched uranium (LEU) targets for 99Mo production. In this process, an LEU metal foil target is dissolved in a mixture of sodium hydroxide and hydrogen peroxide, then 99Mo is recovered from the dissolved solution. They focused on the dissolution kinetics to develop a mechanistic model for predicting the products and the rate of uranium dissolution under process conditions. They thoroughly studied the effects of hydrogen peroxide concentration, sodium hydroxide concentration, and temperature on the rate of uranium dissolution. It was found that uranium dissolution can be classified into a low-base (0.2M) and a high-base ( 0.2M) process. In the low-base process, both the equilibrium hydrogen peroxide and hydroxide concentrations affect the rate of uranium dissolution; in the high base process, uranium dissolution is a 0.25th order reaction with respect to the equilibrium hydrogen peroxide. The dissolution activation energy was experimentally determined to be 48.8 kJ/mol. Generally, the rate of uranium dissolution increases to a maximum as the hydroxide concentration is increased from 0.01 to about 1.5M, then it decreases as the hydroxide concentration is further increased. The alkalinity of the dissolution solution is an important factor that affects not only the dissolution rate, but also the amount of radioactive waste.
Book Synopsis Electroplating Fission-recoil Barriers Onto LEU-metal Foils for 99Mo-production Targets by :
Download or read book Electroplating Fission-recoil Barriers Onto LEU-metal Foils for 99Mo-production Targets written by and published by . This book was released on 1997 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electroplating experiments on uranium foil have been conducted in order to develop low-enriched uranium composite targets suitable for the production of 99Mo. Preparation of the foil surface prior to plating was found to play a key role in the quality of the resultant coating. A surface preparation procedure was developed that produces both zinc and nickel coatings with the desired level of coating adherence and coverage. Modifications of the existing plating processes now need investigation to improve to uniformity of the plating thickness, especially at the foil perimeter.
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