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Author: R. W. Bohl Publisher: ISBN: Category : Alloys Languages : en Pages : 34
Book Description
The equilibrium microstructures and the kinetics of gamma decomposition of uranium-fissium alloys containing technetium were studied and compared with the characteristics of similar alloys which did not contain technetium. The technetium concentration in the fissium was 12.5 wt.% and the uranium-fissium alloys that were examined contained from 3 to 10 wt.% fissium.
Author: R. W. Bohl Publisher: ISBN: Category : Alloys Languages : en Pages : 34
Book Description
The equilibrium microstructures and the kinetics of gamma decomposition of uranium-fissium alloys containing technetium were studied and compared with the characteristics of similar alloys which did not contain technetium. The technetium concentration in the fissium was 12.5 wt.% and the uranium-fissium alloys that were examined contained from 3 to 10 wt.% fissium.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The equilibrium microstructures and the kinetics of gamma decomposition of uranium-fissium alloys containing technetium were studied and compared with the characteristics of similar alloys which did not contain technetium. The technetium concentration in the fissium was 12.5 wt% and the uranium-fissium alloys that were examined contained from 3 to 10 wt% fissium. The presence of technetium did not result in the presence of any new phases; it produced only minor changes in the phase relationshipB and in the stability of the gamma- uranium solid solution. Studies of aging behavior and of the structure of slowly cooled alloys indicated that the gamma is slightly more sluggish in its transformation characteristics in the presence of technetium. On this basis, it appears that the property measurements made earlier on uranium --fissium alloys which did not contain technetium can be reliably applied to true fissium alloys. (auth).
Author: Publisher: ISBN: Category : Languages : en Pages : 2
Book Description
A recent study (Report ANL-6495) was completed in which the phase relationships and decomposition kinetics of alloys with the complete fissium analysis were measured and compared with U-Fs alloys without technetium. The presence of the Tc addition appeared to have a relatively minor influence on the U-Fs alloys. (W.D.M.).
Author: Howard Savage Publisher: ISBN: Category : Breeder reactors Languages : en Pages : 34
Book Description
The heat contents of high-purity uranium and uranium-fissium alloys containing 3, 5, and 8 wt.% fissium were measured at temperatures from 0 deg C through their fusion temperatures. The total heat content above 0 deg C was determined by drop calorimetry and quantitative differential thermal analysis.
Author: S. T. Zegler Publisher: ISBN: Category : Crystals Languages : en Pages : 56
Book Description
A study was made of the phase relations and the properties of uranium-fissium alloys which have compositions bracketing that intended for the first core loading of Experimental Breeder Reactor II. The fissium aggregate in the alloys consisted of the elements Zr, Nb, Mo, Ru, Rh, and Pd. Phase relations are shown to parallel closely those in the dominant U--Mo--Ru ternary system. The uranium gamma phase is stabilized down to 552 deg C, while the beta phase is entirely suppressed at high fissium contents. Certain crystallographic data are given and the minor phases that occur in the alloys are identified. In cast and gamma-quenched alloys the retention of the high-temperature gamma phase produced low hardness and low density. The thermal expansion behavior of the alloys is shown to be dependent upon composition and prior thermal history. Thermal conductivity data are presented for uranium and the uranium-fission alloys. The thermal conductivities of the alloys decrease with increasing fissium concentration.
Author: National Research Council Publisher: National Academies Press ISBN: 0309130395 Category : Medical Languages : en Pages : 220
Book Description
This book is the product of a congressionally mandated study to examine the feasibility of eliminating the use of highly enriched uranium (HEU2) in reactor fuel, reactor targets, and medical isotope production facilities. The book focuses primarily on the use of HEU for the production of the medical isotope molybdenum-99 (Mo-99), whose decay product, technetium-99m3 (Tc-99m), is used in the majority of medical diagnostic imaging procedures in the United States, and secondarily on the use of HEU for research and test reactor fuel. The supply of Mo-99 in the U.S. is likely to be unreliable until newer production sources come online. The reliability of the current supply system is an important medical isotope concern; this book concludes that achieving a cost difference of less than 10 percent in facilities that will need to convert from HEU- to LEU-based Mo-99 production is much less important than is reliability of supply.
Author: J. A. Horak Publisher: ISBN: Category : Alloys Languages : en Pages : 40
Book Description
A total of 35 specimens of U-Pu-fissium alloy and 2 specimens of U-10 wt% Pu-5 wt% Mo alloy were irradiated as a part of the fuel-alloy development program for fast breeder reactors at Argonne National Laboratory. Total atom burnups ranged from 1.0 to 1.8% at maximum fuel temperatures ranging from 230 to 470 deg C. Emphasis was placed on the EBR-II Core-III reference fuel material, which is an injection-cast, U-20 wt% Pu-10 wt% fissium alloy. It was found that this material begins to swell catastrophically at irradiation temperatures above 370 deg C. The ability of the fuel to resist swelling did not appear to vary appreciably with minor changes in zirconium or fissium content. Decreasing the Pu to 10 wt%, however, significantly improved the swelling behavior of the alloy. Both pour-cast and thermally cycled material and pour-cast, extruded, and thermally cycled material appeared to be more stable under irradiation than injection-cast material. Under comparable irradiation conditions, the specimens of U-20 wt% Pu- 5 wt% Mo alloy were less dimensionally stable than the U-Pu-fissium alloys investigated.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A study was made of the phase relations and the properties of uranium-- fissium alloys which have compositions bracketing that intpnded for the first core loading of Experimental Breeder Reactor II. The fissium aggregate in the alloys consisted of the elements Zr, Nb, Mo, Ru, Rh, and Pd. Phase relations are shown to parallel closely those in the dominant U--Mo--Ru ternary system. The uranium gamma phase is stabilized down to 552 deg C, while the beta phase is entirely suppressed at high fissium contents. Certain crystallographic data are given and the minor phases that occur in the alloys are identified. In cast and gammaquenched alloys the retention of the high-temperature gamma phase produced low hardness and low density. The thermal expsnsion behavior of the alloys is shown to be dependent upon composition and prior thermal history. Thermal conductivity data are presented for uranium and the uranium-- fission alloys. The thermal conductivities of the alloys decrease with increasing fissium concentration. (auth).
Author: National Academies of Sciences, Engineering, and Medicine Publisher: National Academies Press ISBN: 0309445310 Category : Medical Languages : en Pages : 264
Book Description
The decay product of the medical isotope molybdenum-99 (Mo-99), technetium-99m (Tc-99m), and associated medical isotopes iodine-131 (I-131) and xenon-133 (Xe-133) are used worldwide for medical diagnostic imaging or therapy. The United States consumes about half of the world's supply of Mo-99, but there has been no domestic (i.e., U.S.-based) production of this isotope since the late 1980s. The United States imports Mo-99 for domestic use from Australia, Canada, Europe, and South Africa. Mo-99 and Tc-99m cannot be stockpiled for use because of their short half-lives. Consequently, they must be routinely produced and delivered to medical imaging centers. Almost all Mo-99 for medical use is produced by irradiating highly enriched uranium (HEU) targets in research reactors, several of which are over 50 years old and are approaching the end of their operating lives. Unanticipated and extended shutdowns of some of these old reactors have resulted in severe Mo-99 supply shortages in the United States and other countries. Some of these shortages have disrupted the delivery of medical care. Molybdenum-99 for Medical Imaging examines the production and utilization of Mo-99 and associated medical isotopes, and provides recommendations for medical use.
Author: R. W. Bohl
Author: R. W. Bohl
Author: 
Author: 
Author: Howard Savage
Author: S. T. Zegler
Author: National Research Council
Author: J. A. Horak
Author: 
Author: 
Author: National Academies of Sciences, Engineering, and Medicine