Present and future sources of protons and heavy ions. [Medical facilities] (open access)

Present and future sources of protons and heavy ions. [Medical facilities]

A brief outline of existing medical heavy-ion facilities is given. The beam specifications for future dedicated medical ion accelerators are discussed. Machines capable of delivering dose rates of approximately 1 krad/min in volumes of a few liters are shown to represent existing technology. A cost and performance analysis shows the synchrotrons to be the most economical source for the heavier ions while conventional cyclotrons seem optimal for an exclusive proton facility. It is seen that the incorporation of additional capabilities such as neutron generation or radioisotope production can be achieved at modest incremental costs. In addition to the accelerators, feasible layouts of hypothetical facilities are discussed, and three-dimensional beam scanning is shown to allow the irradiation of large volumes without sacrificing the precise dose localization capabilities of heavy-ion beams. Concepts of quality-controlled engineering and modern computer technology are introduced as a means to obtain the desired high degree of reliability and ease of operation and maintenance.
Date: September 13, 1976
Creator: Grunder, H. A. & Leemann, C. W.
Object Type: Article
System: The UNT Digital Library
Operation and control of high density tokamak reactors (open access)

Operation and control of high density tokamak reactors

The incentive for high density operation of a tokamak reactor was discussed. It is found that high density permits ignition in a relatively small, moderately elongated plasma with a moderate magnetic field strength. Under these conditions, neutron wall loadings approximately 4 MW/m/sup 2/ must be tolerated. The sensitivity analysis with respect to impurity effects shows that impurity control will most likely be necessary to achieve the desired plasma conditions. The charge exchange sputtered impurities are found to have an important effect so that maintaining a low neutral density in the plasma is critical. If it is assumed that neutral beams will be used to heat the plasma to ignition, high energy injection is required (approximately 250 keV) when heating is accompished at full density. A scenario is outlined where the ignition temperature is established at low density and then the fueling rate is increased to attain ignition. This approach may permit beams with energies being developed for use in TFTR to be successfully used to heat a high density device of the type described here to ignition.
Date: September 13, 1976
Creator: Attenberger, S. E. & McAlees, D. G.
Object Type: Article
System: The UNT Digital Library
XPS studies of actinide materials. [X-ray photoemission spectroscopy, review] (open access)

XPS studies of actinide materials. [X-ray photoemission spectroscopy, review]

Applications of x-ray photoemission spectroscopy (XPS) to the study of actinide materials are reviewed. Examples discussed here include the band structures of thorium and uranium metal, the multiplet structure associated with the 5f electron states in oxides of the transuranium elements, the test for temporal configurations in NpO/sub 2/, crystal field splitting of the U 6p/sub /sup 3///sub 2// level in a series of uranyl compounds, mixed oxidation states in Cf/sub 7/O/sub 12/, and a test for the participation of 5f electrons in bonding in a series of uranium compounds.
Date: September 13, 1976
Creator: Veal, B. W.; Lam, D. J.; Hoekstra, H. R.; Diamond, H. & Carnall, W. T.
Object Type: Article
System: The UNT Digital Library
Parameter study of dual-mode space nuclear fission solid core power and propulsion systems, NUROC3A. AMS report No. 1239c (open access)

Parameter study of dual-mode space nuclear fission solid core power and propulsion systems, NUROC3A. AMS report No. 1239c

The three-volume report describes a dual-mode nuclear space power and propulsion system concept that employs an advanced solid-core nuclear fission reactor coupled via heat pipes to one of several electric power conversion systems. The NUROC3A systems analysis code was designed to provide the user with performance characteristics of the dual-mode system. Volume 3 describes utilization of the NUROC3A code to produce a detailed parameter study of the system.
Date: September 13, 1976
Creator: Smith, W. W. & Layton, J. P.
Object Type: Report
System: The UNT Digital Library
Legalized Gambling in United States. (open access)

Legalized Gambling in United States.

This report is about the Legalized Gambling in United States.
Date: September 13, 1976
Creator: Congressional Research Service
Object Type: Report
System: The UNT Digital Library
Legalized Gambling in the United States (open access)

Legalized Gambling in the United States

This report is an analysis of legal gambling methods in the United States and their history.
Date: September 13, 1976
Creator: McCalip, Bernevia
Object Type: Report
System: The UNT Digital Library
Legalized Gambling in United States. (open access)

Legalized Gambling in United States.

This report is about the Legalized Gambling in United States in the year 1976
Date: September 13, 1976
Creator: Congressional Research Service
Object Type: Report
System: The UNT Digital Library
Legalized Gambling in United States. (open access)

Legalized Gambling in United States.

This report is about the Legalized Gambling in United States.
Date: September 13, 1976
Creator: Congressional Research Service
Object Type: Report
System: The UNT Digital Library