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- <p>Bismuth<br />Mössbauer effect<br />Spectrometer -- Design and construction</p> (1)
- <p>Electromagnetic waves -- Mathematical models<br />Doppler effect<br />Faraday effect</p> (1)
- <p>Neutron flux -- Measurement<br />Nuclear reactors -- Shielding (Radiation)</p> (1)
- <p>Radiation chemistry<br />Radiation dosimetry</p> (1)
Articles 1 - 4 of 4
Full-Text Articles in Physics
Absolute Soft X-Ray Dosimetry For Radiation Chemistry Studies, Howard Sajon Joyner
Absolute Soft X-Ray Dosimetry For Radiation Chemistry Studies, Howard Sajon Joyner
Masters Theses
"A homogeneous, variable plate separation ion chamber consisting of a polyethylene body and employing flowing ethylene as the cavity gas has been designed and tested for the specification soft x-ray (<75kV) energy deposition in typical hydrocarbons. The variable plate separation feature provided primary data on the differential specific ionization originating within the cavity gas occupying the effective collector volume which is independent of inherent chamber inhomogeneities associated with the electrically conducting films comprizing the chamber electrodes. These data demonstrated that charged particle equilibrium is established within the first few ten thousandths of an inch in typical solid hydrocarbons irradiated with this class of sources. Comparison of this type of chamber with a fixed plate separation, static cavity gas mode of operation showed that the latter may predict dose rates with inherent errors exceeding 100%. With the quality of electronic readout accessories presently available, the variable plate separation chamber yielded dose rate data exhibiting a probable error of 3.8 percent (plus the unknown uncertainty in the literature data on the energy required to form an ion pair), and an ultimate limiting error of less than 2 percent appears feasible"--Abstract, page ii.
The Mössbauer Effect In Bismuth Ferrate, Bruce A. Banks
The Mössbauer Effect In Bismuth Ferrate, Bruce A. Banks
Masters Theses
"The magnetic hyperfine structure of the Fe⁵⁷ nuclei in bismuth ferrate was investigated using the Mössbauer effect. A Mössbauer effect spectrometer was built with consideration given to the elimination of vibration and the optimizing of the source, absorber, and detector geometries to produce the largest fractional Mössbauer effect per fractional standard deviation. The internal magnetic field at the Fe nuclei in BiFeO₃ was determined to (482 ± 9) kilooersteds at room temperature"--Abstract, page ii.
The Faraday Rotation And Dispersive Doppler Effects In The Ionosphere At Oblique Incidence, Charles Roland Baugher Ii
The Faraday Rotation And Dispersive Doppler Effects In The Ionosphere At Oblique Incidence, Charles Roland Baugher Ii
Masters Theses
"Integral equations for the isotropic and anisotropic ray path of a radio wave propagating through the ionosphere are developed. These equations assume a spherically stratisfied ionosphere and are equivalent to a detailed ray-tracing process. A method is devised to utilize these equations in the evaluation of combined Faraday rotation and dispersive Doppler data from earth satellites for subionospheric electron content. The method, which corrects for horizontal ionospheric gradients, is applied to data from the Explorer 22 satellite and some preliminary results are discussed"--Abstract, page ii.
The Construction Of A Multi-Threshold Foil For Fast Flux Measurements, Michael Henry Holkenbrink
The Construction Of A Multi-Threshold Foil For Fast Flux Measurements, Michael Henry Holkenbrink
Masters Theses
"The construction of a multi-threshold foil for fast neutron flux measurements is investigated. The factors governing the selection of the materials are the energy response of the given reactor, the half-life of the daughter, the prominent gamma ray emitted during decays, the power level of the reactor, the availability of adequate cross section data, and the alloying properties of the composite foil. A ternary system was chosen as a compromise between the difficulty of fabrication and the amount of information gained from one foil. The particular system chosen was In- P- Fe. The threshold reactions of these elements are In¹¹⁵ …