Essays about: "isotope composition"

Showing result 1 - 5 of 26 essays containing the words isotope composition.

  1. 1. Development of a Neutron Activation Analysis station at the Lund Ion Beam Analysis Facility

    University essay from Lunds universitet/Kärnfysik; Lunds universitet/Fysiska institutionen

    Author : Josephine Lindsey-Clark; [2021]
    Keywords : Neutron Activation Analysis; NAA; European Spallation Source; ESS; Lund Ion Beam Analysis Facility; LIBAF; Gamma-Ray Spectra; Physics and Astronomy;

    Abstract : This report outlines the first stages of the development of the Neutron Activation Analysis station at the Lund Ion Beam Analysis Facility in the Division of Nuclear Physics, Lund University. The motivation for this project is to use the Neutron Activation Analysis detection technique for environmental monitoring around the European Spallation Source, soon to come into operation. READ MORE

  3. 2. An annual evaluation of CH4 oxidation in a freshwater lake

    University essay from Linköpings universitet/Tema Miljöförändring

    Author : Eldina Cehic; [2020]
    Keywords : Methane oxidation; isotopic fractionation; stratification; open steady-state and closed system.; Metanoxidation; isotopfraktionering; stratifiering; öppet stabilt system och stängt system;

    Abstract : Freshwater lakes constrain its methane (CH4) emissions through CH4 oxidation. CH4 includes three carbon (C) isotopes; the stable isotopes 12C,13C and the unstable and more uncommon isotope 14C. Methanotrophs (i.e. READ MORE

  4. 3. A study of the photochromic effect in oxygen containing rare-earth metal hydride thin films and multilayer structures

    University essay from Uppsala universitet/Tillämpad kärnfysik

    Author : Sigurbjörn Már Aðalsteinsson; [2020]
    Keywords : ;

    Abstract : In this work, we have studied the photochromic response of several oxygen containing rare-earth hydride thin films (REHO, RE = Y, Nd, Gd, and Dy). Their chemical composition was characterized by an iterative multi-method approach based on ion beams, while the photochromic effect was measured by means of optical spectrometry. READ MORE

  5. 4. Iron and Oxygen Isotope Signatures of Magnetite in Iron Ore of Kiruna Type

    University essay from Uppsala universitet/Mineralogi, petrologi och tektonik

    Author : Malin Andersson; [2020]
    Keywords : IOA-deposits; magnetite; SIMS; EBSD; Fe- and O isotopes; laser fluorination;

    Abstract : Stable isotope analysis of iron and oxygen isotopes in magnetite of Kiruna-type from Sweden and Chile have been conducted to further the understanding of the formation, and advance the analysis methods of these deposits. For this, data from SIMS (secondary ion mass spectroscopy), EBSD (electron backscatter diffraction) and triple oxygen analysis (by laser fluorination) are used. READ MORE

  6. 5. Exploring the physiological variables of oxygen isotope composition in chondrychthyan teeth

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning; Uppsala universitet/Institutionen för organismbiologi; Uppsala universitet/Evolutionsbiologi

    Author : Carlos Oliveira; [2019]
    Keywords : chondrichthyan; oxygen; isotope; fractionation; teeth; enameloid; dentine;

    Abstract : Since the discoveries of vertebrate bioapatite’s ability to record oxygen isotopecomposition of ambient seawater were made (Kolodny, 1983), oxygen isotopes have beenwidely used as a climatic and oceanographic proxy. The δ18OP aquatic vertebrate apatite isa function of the δ18Ow value of the ambient water, yet “vital effects” on the δ18OP compositionhave been reported previously (Venneman et al. READ MORE