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Visar resultat 21 - 25 av 128 uppsatser som matchar ovanstående sökkriterier.

  1. 21. Accumulation of 63Ni, 106Ru and 125Sb in phytoplankton

    Master-uppsats,

    Författare :Yusuf Ali; [2022-08-22]
    Nyckelord :Medical physics; Environmental radiology; Nuclear Power Plants; concentration factor CF ; phytoplankton; phaeodactylum tricornutum; radioactive releases; nickel; ruthenium; antimony; gamma spectroscopy; liquid scintillation counting;

    Sammanfattning : Background: Nuclear Power Plants (NPPs) release small amounts of radionuclides which contribute with a low radiation dose to the environment as well as humans and animals. In this context, marine ecosystems are critical, since most NPPs in Sweden are located by the sea. LÄS MER

  3. 22. Evaluation of whole-body bone scans performed using a gamma camera with Cadmium Zinc Telluride detector

    Master-uppsats,

    Författare :Victor Asp; [2022-01-13]
    Nyckelord :Medical physics; whole-body bone scans; gamma camera; Cadmium Zinc Telluride detector;

    Sammanfattning : The bone scan is a common nuclear medicine imaging procedure that is mainly used for evaluating several oncological patient groups. A radioactive tracer, 99mTc -labelled diphosphonate, is injected intravenously and accumulates in the skeleton. The distribution of the tracer in the body is measured with a gamma camera 3 hours post-injection. LÄS MER

  4. 23. Establishment of a deep learning algorithm for dosimetry of radiopharmaceuticals

    Master-uppsats,

    Författare :Dennis Lipnicevic; [2022-01-13]
    Nyckelord :Medical physics; automated segmentation; dosimetry; kidney; nuclear medicine dosimetry; deep learning; convolutional neural network;

    Sammanfattning : Purpose: The aim of this study was to introduce a volumetric convolutional neural network for segmentation of the kidneys in SPECT images and to apply it in the dosimetry of radiopharmaceuticals of this organ, in order to decrease segmentation time and to standardize the segmentation of the kidneys. Method: Three networks were trained using two network architectures and a total of 216 retrospectively collected images from patients that underwent imaging procedures at Sahlgrenska University Hospital between 2009 and 2018. LÄS MER

  5. 24. Determination of the source strength of an AmBe neutron source and design of flexible holder system for accurate measurements of ionising radiation

    L2-uppsats, Uppsala universitet/Tillämpad kärnfysik

    Författare :Mathilde Ragot; [2022]
    Nyckelord :neutron source nuclear physics;

    Sammanfattning : The goal of this project was to determine the source strength of an Americium-Beryllium neutron source by irradiating metal foils of different elements. The irradiated foils were then placed on a High Purity Germanium detector and γ-decay from the decay of the neutron induced reaction products was observed and used to deduce the neutron flux. LÄS MER

  7. 25. Prototyping of an automated cyclic Neutron Activation Analysis setup

    Master-uppsats, Lunds universitet/Kärnfysik; Lunds universitet/Fysiska institutionen

    Författare :Cornelius Maurer; [2022]
    Nyckelord :Nuclear Physics; Neutron activation analysis; cyclic-NAA; Physics and Astronomy;

    Sammanfattning : A prototype Neutron Activation Analysis (NAA) setup based on a Deuterium-Tritium (DT) neutron generator is under development at Lund University. It serves as proof-of-principle for NAA based on a Compact Accelerator-driven Neutron Source. LÄS MER