Azimuthal dependence of the atmospheric gamma-ray background

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dc.contributor.advisorHaymes, Robert C.en_US
dc.creatorShelton, David Harolden_US
dc.date.accessioned2018-12-18T21:15:46Zen_US
dc.date.available2018-12-18T21:15:46Zen_US
dc.date.issued1975en_US
dc.description.abstractOn May 15, 1973 a balloon borne gamma-ray detector belonging to Rice University was launched from Palestine, Texas. From 19:4 CDT to 21:25 CDT the atmospheric gamma ray background was observed from 56 KeV to 12.4 MeV in energy. The directional detector was pointed at a constant zenith angle of 13.4° and viewed the atmospheric background at all values of azimuth angle. The experiment was carried out at altitudes of roughly 3.5 gm/cm2 residual atmosphere. The detector consisted of a central crystal of Nal(Tl) which was actively collimated by a shield of the same material. The instrument had a beam width of 15° full width half maximum. Results are consistent with an observed sinusoidal perturbation of the average background count rate between 56 KeV and 375 KeV of the form R = B[1 + (.188 ± .33)sin(Az - (12° ± 22°))] where R is the photon count rate, B is the average photon count rate, and Az is the azimuth angle at which the instrument was pointed. No similar behavior was observed at other energies.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent92 ppen_US
dc.identifier.callnoThesis Sp. Sci. 1975 Sheltonen_US
dc.identifier.citationShelton, David Harold. "Azimuthal dependence of the atmospheric gamma-ray background." (1975) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/103970">https://hdl.handle.net/1911/103970</a>.en_US
dc.identifier.digitalRICE1596en_US
dc.identifier.urihttps://hdl.handle.net/1911/103970en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleAzimuthal dependence of the atmospheric gamma-ray backgrounden_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentSpace Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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