UNT Libraries Government Documents Department - 43 Matching Results
Search Results
- Analysis of the Energy of Neutrons Emerging from the Target by Means of Their Spatial Distribution
- As there is no accurate measurements of the energy distribution of neutrons emerging from large uranium blocks, it becomes of importance to see how much information of this kind can be derived from the slowing down distribution of the neutrons in a water tank.
- The Biological Behavior of Organic Compounds Containing Radiophosphorus
- The study was undertaken with the objective of observing the distribution in the rat of organic compounds of phosphorus labelled with the P32 isotope as tracer. The fate of several of these compounds was studied in animals bearing tumors. The distribution of inorganic phosphate in animal tissues is well known but was included in this work for comparison with the organic phosphorus compounds.
- Calculation of Geometrical Efficiency of Counters
- Let F be the flux of radiation going from a sample of radius R2 to a counter of radius B1 then the emitted intensity of radiation per unit solid angle. Then the flux between two elements of area do1 and do2 will be given by [equation] since [equation] and [equation]. Calculations and equations follow.
- Chemistry Division Quarterly Report March, April, May 1952
- Quarterly progress reports on various projects in the Chemistry Division.
- Chemistry Division Quarterly Report: September, October, November, 1952
- Quarterly progress report for the Chemistry Division of the University of California Radiation Laboratory: nuclear chemistry, bio-organic chemistry, metals and high temperature thermodynamics, basic chemistry, and chemical engineering.
- The Cloverleaf Cyclotron Three Phase Radiofrequency System
- The geometry of the magnetic pole structure in the cloverleaf cyclotron suggests the use of three dees excited by three phase rf placed in the valleys out of the way of the beam. Experience with the model machines indicates that it is desirable to be able to vary the phase angles between the three dee voltages through 30 or 40 degrees and to be able to maintain them at any given value within plus or minus one degree. It is desirable, also, to be able to vary the phase angle independently of the amplitude of the dee voltages. There are several possible ways of meeting these requirements. The one which was chosen appears to be the most flexible and to best meet the problems presented by the center geometry of the machine.
- Considerations on the Effect of Beam-Dee Coupling in a Cyclotron RF System
- Analysis of the problem of accelerating ions in a Thomas cyclotron has been confined almost entirely to the integration of various equations of motion (for single particles) for which a complete field description is necessary. In contrast, the problem of principal interest to rf system engineers concerns the gross transfer of electrical energy from an rf generator into an accelerated beam.
- The Distribution of Pu(VI) and Pu(III) in Thenoyltrifluoracetone-Benzene-Nitric Acid Mixtures
- The distribution coefficients of Pu(VI) and Pu(III) have been measured as a function of the TTA, hydrogen ion, and nitrate ion concentrations in the TTA-benzen-nitric acid system. The extraction constants for Pu(VI) and Pu(III) are 1.4 X 10(-2) and 2 X 10(-5), respectively.
- Drift Tube Model Magnet Report
- Early in the design of the Mark I accelerator it was decided to install magnetic lenses in the drift tubes. A number of model magnets were constructed and tested to determine the best design for these lenses. This report includes only the results of the tests on the final models of the magnets that are designed for Mark I.
- Effect of Inositol and Octadecyl Alcohol Feeding on Lipoproteins in Cholesterol Fed Rabbits.
- A controversy exists as to the effect of inositol and other lipotropic agents on serum cholesterol levels and atherosclerosis in humans and animals. There is no general agreement that these agents lower serum cholesterol levels or exert an inhibitory effect on the development of atherosclerosis.,
- Energy Spectrum of Neutrons from 3-10 MEV
- The energy distributions of neutrons in the 3-10 Mev energy range resulting from the bombardment of thin U targets are being investigated by the measurement of proton recoils in photographic plates.
- Flux in a Rectangular Cavity.
- A problem proposed by E. Hart to determine whether there are locally high or low neutron densities at the corners of a cubical cavity in a graphite lattice. To simplify the computations consider an infinite two dimensional lattice with a square cavity that has a point source of neutrons at the center (see Figure 1).
- Full Scale Drift Tube Magnet Report
- Measurements were made on the full scale drift tube magnets to check values predicted from the model magnets measurements. These investigations were carried out by the magnetic measurements group.
- The Heat and Entropy of Ionization of Anhydrous Acetic Acid.
- Studies of ionic entropies in methanol and ammonia have led to the suggestion that ionic entropies in water are abnormally high. An explanation of this hypothesis may be given in terms of entropies of solvation and the high degree of hydrogen bonding in water. When an ion enters water, more disorder is created than when it enters another, less hydrogen-bonded, solvent.
- An Investigation of the Isotopes of Americium and Curium
- Isotopes of americium and curium with mass numbers less than 242 have been produced by cyclotron bombardment techniques, and several of their nuclear properties have been investigated. The partial alpha half-lives of Am(239), Cm(241), and Cm(240) and the partial half-life for spontaneous fission of Cm(240) were measured. The alpha decay daughter of Cm(238) was found and evidence for the discovery of Am(237) (an -1 hour electron capture activity) and Cm(239) (an -10 hour electron capture activity) has been presented. An Appendix indicating the conditions for separation of the plus three actinides by selective elution from ion exchange resin with citric acid has been included.
- The Masses of the Heavy Isotopes
- Radioactive decay data are used to calculate the atomic masses of the heavy isotopes, A> 203. The four radioactive families are then connected by means of neutron binding energies known from reactions on various isotopes. Finally all the masses are collectively adjusted for the best fit with mass spectrographic information available in this region. The masses so calculated are presented. Differences between masses of isotopes are estimated to have an of (plus/minus) 0.00020 mas units or about 200 Kev; the position of the masses taken collectively is in doubt by about 1.5 Mev.
- Mathematical Theory of the Lethal Action of Radiation on Yeast Cells
- The main part of this thesis is devoted to the derivation and study of formulas for the probability of survival of the haploid and diploid yeast cell, based on models proposed by Zirkle and Tobias. Some properties of so-called completely monotonic functions are developed, and the results are applied to the investigation of some of the more complicated formulas. Finally the theoretical expressions are compared with the experimental data obtained by Tobias.
- Medical and Health Physics Quarterly Report - July, August, and September, 1952
- Reports on the biological studies of radiation effects, the metabolic properties of various materials, health physics and chemistry.
- Medical and Health Physics Quarterly Report: October, November, and December 1951
- The document provides reports on medical and health physics, particularly on the biological studies of radiation effects, the metabolic properties of various materials, radiation chemistry, health chemistry, and health physics.
- Modes of Acceleration of Ions in a 3-DEE Cyclotron.
- The analysis shows that a symmetrical three-dee cyclotron accelerating ions below relativistic velocities has the property that ions of different e/m rations can be accelerated without changing the frequency of the electrical power supplied to the dees or the value of the magnetic field. The energy gain per revolution of the ions which can be accelerated in the various modes are found, considering three identical dees of arbitrary angular widths. For these calculations it has been assumed that a step-function voltage change occurs at each edge of the dees.
- MTA, A-12 Development, Drift Tubes - RF and Beam Geometry. Comparison of A-12 to A-24
- The final r.f. characteristics of A-12 are shown. The mechanical features are available in UCRL-1859. If A-12 were to be changed to 24.2 mm rather than 12.1 mm, keeping the same length and the same constant average coil gradient of 0.375 MV/ft., the characteristics of such an A-24 can be obtained from the attached curves.
- MTA Mark II Accelerator, Drift Tube and RF Beam Geometry Perturbing Effect of Beam in A-12
- The question has arisen of how the beam in A-12 as a long resonant cavity might effect the frequency of operation and the field distribution. This study is published to make available the calculation of the direct beam effect as an illustration of general methods of attacking perturbing effects in resonant cavities.
- MTA Quarterly Progress Report - June, July, August, 1952
- MTA quarterly progress report for June-August 1952
- MTA Quarterly Progress Report - March, April, May, 1952
- Quarterly report on projects - special M.T.A. distribution
- MTA Quarterly Progress Report: September, October and November, 1951
- Quarterly report which includes brief summaries of research studies related to technology materials and accelerator testing.
- MTA Target Equations
- In solving the two-group, two medium equations for neutron diffusion in a finite one-dimensional multiplying system, the equations in each medium can be solved, and the boundary conditions used to determine the coefficients. This direct attack involves eight simultaneous linear equations. The opportunities for error are numerous, and, frequently, a great deal of accuracy is lost by subtractions; hence, it is felt that an alternative method of solution, in which numerical errors would be less likely to occur, would be desirable.
- Neutron Streaming in a Cylindrical Cavity
- The free streaming of neutrons in a cylindrical cavity is investigated. Using experimental data for the flux distribution along the walls, the direct beam hole loss and leakage into the target from the lattice is estimated for the MTA system.
- Nuclear Excitation and Recoil by High Energy Particles
- The less probable nucleon-capture reaction induced by high-energy particles has been investigated in order to see what is the highest possible energy of a nucleon to be able to stay inside the nucleus.
- Physics Division Quarterly Report: August, September and October, 1951
- Quarterly summary report of studies conducted through the Radiation Laboratory, University of California. Some results reported in the report may be of a preliminary or incomplete nature.
- Physics Division Quarterly Report: February, March and April, 1952
- Quarterly summary report of studies conducted through the University of California Radiation Laboratory. Some results reported in the report may be of a preliminary or incomplete nature.
- Physics Division Quarterly Report - May, June, and July, 1952
- Physics Division quarterly report - general physics research projects and accelerator operation and development.
- Physics Division Quarterly Report: November and December, 1951 and January, 1952
- Quarterly summary report of studies conducted through the Radiation Laboratory, University of California. Some results reported in the report may be of a preliminary or incomplete nature.
- Preliminary Studies for the Separation of HD from H2 by Rectified Absorption
- The feasibility of rectified absorption for the recovery and purification of HD from H2 streams has been investigated. The absorbent considered was liquid nitrogen at 78 (degrees) K. The process appears to present no major engineering or operation problems. Cost calculations indicate that the process may be economically competitive with other processes. Process design was based on an estimated separation factor of 1.25 between H2 and HD in this system. Experimental work has been undertaken to check the validity of this estimate and to investigate the possibility of using other absorbents such as hydrocarbons and fluorocarbons.
- Proposed R.F. Buncher for A-12
- A buncher and pre-accelerator for A-12 is described that has 360 degree acceptance and could handle a current of one ampere from a low voltage source.
- Spark Damage and High Voltage Breakdown of Metals in Vacuum at 14 Megacycles
- The work reported here is a continuation of that reported in UCRL-1962. Approximate breakdown voltages and spark damage estimates have been made for the metals Ag, Ti, Aluminum Alloy 52-SO, Stainless Steel 316 and various combinations of Inconel and Cu.
- Sparking and X-Rays in a Mercury Pumped Vacuum System (Excerpt From Quarterly Report for March, April, May, 1952 - Linac Group - UCRL-1903)
- Sparking: The most obvious conclusion about 200 m.c. sparking is that it follows strictly surface gradient and does not depend upon total voltage. In order to arrive at this conclusion, a quantitative means for measuring the probability of sparking had to be constructed, since it was clearly evident that the d.c. notion of sparking was inadequate.
- Summary of Research Progress Meetings of October2 and October 9, 1952
- Summary of research progress meetings of October 2 and October 9, 1952: High speed high vacuum ion pump, High energy ion irradiation, Space charge accelerator for protons, Availability of the [ ] meson beam at the cyclatron, Effect of chemical structure on stopping powers for high energy protons.
- Summary of the Research Progress Meeting of June 12, 1952
- Summary of the research progress meeting of June 12, 1952
- Summary of the Research Progress Meetings for January, 1952.
- Summary of progress on various research projects conducted during January, 1952.
- Theoretical Considerations on Cell Shape, Convection, and an Area Anomaly Pertinent to Developing a Moving Boundary Theory for Ultracentrifugation
- The intuitive concept that a sector shaped centrifuge cell is free from convection is criticized. Not only is a form of convection present for a single sedimenting species, but a more insidious type occurs in a mixture having an appreciable Johnston-Ogston effect. Rather than striving for convection-free sedimentation, the proposal is to utilize if possible an apparently harmless type of convection occurring in a very thin annulus in order to avoid the convection extending between boundaries in a mixture. The requirement that the concentrations be independent of time meets this condition and yields a hyperbolic cell, which is approximated by a sector cell placed in the rotor backwards. Simultaneously, area measurements and calculations involving the Johnston-Ogston anomaly are simplified because of the time independence.
- Three Group Equations for a Multiplying Medium
- In the past it was felt that the easiest way to treat a three group equation for a MTA lattice was to solve it without certain terms. This iterative procedure converged rapidly for a medium with depleted uranium fuel, and in fact, a second iteration was not needed.
- Three Lectures On Controlled Thermonuclear Power Production
- This report was written from the notes used by Dr. York in delivering his three lectures on considerations pertinent to the problem of utilizing controlled thermonuclear reactions for the production of power. The first lecture discussed fundamental properties of the DD and DT reactions and the reacting substances. The second lecture described the stellarator, a proposed machine for the controlled production of power from the above reactions. The third lecture described the pinch effect and considered its possible application to the thermonuclear power problem.
- UCRL Lectures on Numerical Analysis and Applied Mathematics: Lecture IX
- The field of mathematics which deals with the construction of charts representing mathematical laws is known as Nomography. Often it is necessary to repeatedly solve mathematical formulae, but with different values for the symbols involved. The manipulation of the formulae, or repeated constructions of graphs, may require considerable work, as well as carry with it the possibility of errors invalidating the results. In such a situation, the construction of a single chart which would serve for all the solutions would obviously be of considerable value.