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.
Results
Showing 1 to 8 of 8 for “"Polonium-210"”.
-
Polonium-210 radioactivity in Lake Mead fish
Polonium-210, a naturally occurring radioisotope, has been found at high concentrations in marine fish. One publication reports much lower concentration (on the order of 10{dollar}\sp{-1}{dollar}) of {dollar}\sp{210}{dollar}Po in fresh-water fish compared to salt-water, although the visceral organs …
-
Investigating the ocean’s biological pump using thorium-235 and polonium-210
… the two radioisotope pairs 234Th/238U and 210Po/210Pb are utilized. Chapter 2 is an update of the 234Th/238U measurement method which simplifies the protocol, and allows for expansion of use. Chapter 3 presents an unprecedentedly extensive, non-steady state study of 234Th/238U to assess POC …
-
Polonium-210 in Freshwater Environments: Analytical Advances, Predictive Modelling, Food Web Transfer and Dose Assessment
Polonium-210 (²¹⁰Po) is a naturally occurring radionuclide of high radiological relevance, yet its occurrence, environmental behaviour and biological transfer in freshwater ecosystems remain poorly characterized. Advances in understanding have been constrained by analytical challenges and by …
-
Aufbau eines Experimentes zur Messung der Emissionswahrscheinlichkeit von Bremsstrahlung im alpha-Zerfall von Polonium-210
Die Emissionswahrscheinlichkeit von Bremsstrahlung kann in den meisten Fällen sehr gut semi-klassisch beschrieben werden. Beim Alpha-Zerfall jedoch tunnelt das Alpha-Teilchen durch die Coulomb-Barriere des Kernes, ein Prozess, der nur quantenmechanisch begriffen werden kann. Hierbei stellt sich die …
-
Studies of alpha-radioactivity in the marine environment
… thorium series nuclides and "excess" unsupported polonium-210 were determined by using the "thorium pairs" technique and by studying the variation of the total alpha count-rate with time. This is considered in Chapter 2. The 'second phase of the investigation was to investigate the alpha-spectrum …
-
Cavity Ringdown Spectroscopy in Nitrogen/Oxygen Mixtures in the Presence of Alpha Radiation
… in nitrogen-oxygen mixtures while the Polonium 210 alpha sources were cycled between being shielded and exposed.</p> <p>The beginning of this thesis will provide brief reviews of ionizing radiation and ozone formation, along with explanations of Cavity Enhanced Absorption Spectroscopy …
-
Realizing a design for a cloud chamber cooled by thermoelectric modules
… region was observed using three materials: Polonium-210, Lead-2 10, and Strontium-90. The cloud chamber can be improved and further work is discussed.