Sökning: "60Co"

Visar resultat 1 - 5 av 7 uppsatser innehållade ordet 60Co.

1. 1. Designing a fast and robust device for measuring and providing graphical visualization of the number of 60Co sources in a Leksell Gamma Knife®

   Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

   Författare :Simon Andersson; [2020]
   Nyckelord :Cobalt 60; LGK; Leksell Gamma Knife; Counting sources; Elekta Instrument AB;

   Sammanfattning : The Leksell Gamma Knife® (LGK) is a device for performing radiosurgery. The LGK contains approximately 200 radioactive sources whose beams intersect in a focal point in order to treat brain tumours. Quality assurance tools are used at Elekta to indirectly assess the number of sources in an LGK from the total amount of radiation. LÄS MER

3. 2. Trace element analysis based on neutron activation with coincident gamma ray detection

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

   Författare :Jessica Delgado; [2017]
   Nyckelord :scintillator detectors; gamma ray; gamma radiation; spectrometer; neutron activation analysis; trace element; Physics and Astronomy;

   Sammanfattning : In this work, six soil samples have been analyzed. The samples come from different sedimentary layers on Earth. They were previously studied with the objective to find the trace concentration of iridium, to correlate the increased concentrations of iridium with meteorite impacts that have occurred on Earth. LÄS MER

4. 3. Assessment of radionuclide content in waste barrels using the Canberra In-Situ Object Counting System (ISOCS)

   Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen; Lunds universitet/Medicinsk strålningsfysik, Lund

   Författare :Marcus Persson; [2015]
   Nyckelord :Medicine and Health Sciences;

   Sammanfattning : In order to store radioactive waste its contents need to be known. Determining radioactive waste can be achieved by different means. The most common method is using a detector to measure the gamma photons produced by the radionuclides in the waste. LÄS MER

5. 4. Detection limits and quantification of 60Co with gamma camera and handheld gamma detectors in human phantoms

   Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

   Författare :Mats Hansson; [2008]
   Nyckelord :Strålskydd; Medicine and Health Sciences;

   Sammanfattning : In an emergency situation where radioactive material has been spread to the environment and large groups of people have been internally contaminated there is a need for rapid examination of the activity contents in those persons. The specific purpose of this work is to explore methods for rapid in-vivo determination of 60Co in humans using equipments not dedicated to whole-body counting, in order to find rapid alternative to whole-body counting in low background localities. LÄS MER

7. 5. Determination of the effective volume of a detector

   Uppsats för yrkesexamina på grundnivå, Medicinsk strålningsfysik (tills m KI)

   Författare :Jonas Grafström; [2007]
   Nyckelord :Gamma knife; Semi conductor; Detector; Effective volume; 60Co;

   Sammanfattning : A method to establish the boundaries of the sensitive volume for a chosen detector to within 50µm (as specified by Elekta Instuments AB) was investigated and is presented in this project. The detector studied was fixed to a positioning system with possibility to move with sub micrometer increments, and scanned in a narrow photon field. LÄS MER