Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"Radioactive isotopes"”.
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Alpha-radioactive isotopes in the marine environment.
… also analysed for Pu-238, Po-210 and - those isotopes of thorium and uranium that are alpha-emitters. In some samples an estimate of the Ra-226 content was also made. The Pu-239 concentrations are compared with the values reported in the literature for similar organisms found in the …
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Further studies on the behavior of fungi in the presence of radioactive isotopes
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Bacteriology, 1949
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Application of stochastic theory to parameter estimation : modeling saturated groundwater flow and transport of radioactive isotopes at a humid site
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1994.
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Photsluminescence of ZnO: Radioactive ion-implantation and transition metal defects
In this thesis, implantation of radioactive isotopes and photoluminescence studies were used to identify defects in ZnO. Implantations of stable and radioactive isotopes of gallium and zinc were performed. From photoluminescence studies of these samples, a feature at 3.3600 eV was shown to be due …
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An investigation into a technique of reconstruction tomography.
… a new type of radioactivity detecting 'camera'. Radioactive isotopes can be injected into a human and their paths through the body can be monitored by these 'cameras'. Conventional 'cameras' involve a moving detector, whereas the static type of 'camera' being developed by Dr J E Bateman at …
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Per Mutations
… literacy. The author uses ballet, grizzly bears, radioactive isotopes, infamous scientists, genetic mutations, the Apollo missions, and other subjects to hold beside her own experiences so that she might better understand how to cope with the death of a loved one. Particularly, in this collection, …
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Numerical modelling of dilatant rock joints
… of the interest in medical applications of radioactive isotopes of group 1118 elements, the indium-maltol complex was studied in order to assess its radiopharmaceutical usefulness. The major analytical techniques used in this study are potentiometry and high resolution nuclear magnetic …
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Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments
… and degradation, and mineral weathering. Radium isotopes (²²³Ra, ²²⁴Ra, ²²⁶Ra, ²²⁸Ra) and radon-222, naturally occurring radioactive isotopes produced in sediments, are well-suited as tracers of nutrients, trace metals, and organic matter cycling processes at the sediment-water interface. In this …
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Study of contaminants in plasmas during decommissioning processes
… exploration of the resultant behavior when non-radioactive isotopes of cesium iodide contaminants are introduced. This plasma system produces traces of ionic species of cesium and iodide, as well as space-dependent deposition patterns: both of which are relevant towards understanding behaviour …
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The rate of decay of fresh fission products from a nuclear reactor
… reactor is complex because of the number of isotopes involved, different types of decay, half-lives of the isotopes, and some isotopes decay into other radioactive isotopes. Traditionally, a simplified rule of t-1.2 or 7s and 10s is used to determine the dose rate from nuclear weapons and can …
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An investigation into the phenomenological relation between solar activity and nuclear beta-decay rates
… the widely-accepted view that nuclear decaying isotopes disintegrate at a constant rate unaffected by external conditions. We study several past cases of radioactive isotopes exhibiting annual periodicities in their decay rates, presumably related to the annual variation in Earth-Sun distance. …
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Studies on the detection of nucleotides and oligonucleotides by mass spectrometry
… dyes in order to eliminate the need for radioactive isotopes. In addition, progress has been made involving elution of nucleotides from a TLC plate and subsequent detection of these nucleotides by mass spectrometry. Together, these results will facilitate future studies that involve …
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Protein engineering for targeted delivery of radionuclides to tumors
… antibodies are conjugated to drugs, toxins, or radioactive isotopes. Unfortunately, antibodies exhibit slow clearance from the body and exposure of healthy tissues to toxins or radiation can result in undesirable side effects that limit the doses that can be safety administered to the patient. …
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Applicability of cosmic ray muon radiography to nuclear nonproliferation
… to the presence of undeclared items, including radioactive isotopes capable arming a nuclear device. Cosmic ray muon radiography offers a passive detection system capable of probing the atomic number, Z, of materials within shipping containers by measuring the deviation of muons as they traverse …
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Anthropogenic and natural radioisotopes as tracers for contaminant sources and particulate fluxes
Radioactive isotopes act as nuclear clocks that are utilized to trace and measure rates of chemical, biological, physical, and geological oceanographic processes. This thesis seeks to utilize both artificial (e.g., released from anthropogenic sources) and natural radioisotopes as tracers within the …
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Anthropogenic and natural radioisotopes as tracers for contaminant sources and particulate fluxes
Radioactive isotopes act as nuclear clocks that are utilized to trace and measure rates of chemical, biological, physical, and geological oceanographic processes. This thesis seeks to utilize both artificial (e.g., released from anthropogenic sources) and natural radioisotopes as tracers within the …
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Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments
… and degradation, and mineral weathering. Radium isotopes (223Ra, 224Ra, 226Ra, 228Ra) and radon-222, naturally occurring radioactive isotopes produced in sediments, are well-suited as tracers of nutrients, trace metals, and organic matter cycling processes at the sediment-water interface. In this …
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Background UV in the 300 to 400 nm region affecting the extended range detection of radioactive material
… to find alternative methods for the detection of radioactive material at extended ranges has resulted in an increased interest in the detection of the air fluorescence resulting from the alpha or beta radioactive particle's interaction with molecules of air. Air fluorescence photons travel further …
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A mass measurement of the short-lived halo nucleus ¹¹Li with the TITAN Penning trap spectrometer
New measurements of the masses of the isotopes⁸,⁹,¹¹Li were made using recently commissioned TITAN Penning trap mass spectrometer at TRIUMF. The measurement of the halo nucleus ¹¹Li represents a new standard in Penning trap mass spectrometry, as it is the shortest lived, t₁/₂ = 8.8 ms, isotope ever …
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Constraining circulation changes through the last deglaciation with deep-sea coral radiocarbon and sedimentary 231Pa/230Th
Radioactive isotopes can be used in paleoceanography both for dating samples and as tracers of ocean processes. Here I use radiocarbon and uranium series isotopes to investigate the ocean’s role in climate change over the last deglaciation. I present a new method for rapid radiocarbon analyses as a …
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