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Title: Time of flight imaging with 3MeV neutrons based on the associated particle technique
Author: Mutamba, Q. B.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2001
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Spatial imaging using the time of flight (TOF) method with 3 MeV neutrons based on the associated particle technique has been demonstrated to produce a tomographic image of an aluminium test object. The imaging set-up used coincidence detection of the neutron-induced inelastic scattered gamma rays from the 27Al(n,n'γ)27 Al nuclear reaction in the test object, and the associated 3He particles from the TiD self-implanted target. The test object was positioned 120 cm away from the target, and rotated in the neutron beam at 72 evenly spaced angles of orientation. The TOF spectrum data that were obtained at each angle were used in the image reconstruction computer programme that used the technique of filtered back-projection to produce the image of the test object. In order to remove deficiencies in the image reconstruction programme, it was tested first with computer simulated TOF spectrum data for the neutrons and the gamma rays that were gathered, using assumptions that were based on experimental conditions. At optimum timing resolution of 1.4 ns and a timing efficiency of 2.2% for the 3He-gamma coincidence were achieved. An equivalent dose of 69.1 μSv per scan was delivered to the test object, and it received a total dose of 4.98 mSv during the 72 scans. A good image of the test object was obtained that had clearly distinguishable walls above the background due to chance coincidence signals. With the possible improvements in the detection efficiency for gamma rays, the timing resolution, and the timing efficiency, we envisage a medical application of the imaging technique to provide spatial information of overloaded elements in parts of the human body as a result of certain diseases. We consider the imaging of aluminium in the bone for patients with chronic renal failure and that of iron in the liver for patients with a haemochromatosis.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available