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Title: Experimental and theoretical investigation of pulsed neutron beams for in vivo analysis
Author: Hussen, T. A.-L.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1991
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This work is concerned with a theoretical and experimental investigation of pulsed neutron beams used in elemental in vivo analysis. The main object of the theoretical work is to develop a Monte Carlo simulation programme to study the history of the incident deuteron beam on the deuterated titanium target in the Van de Graaff neutron generator used as a neutron source for in vivo analysis. Experimental measurements are reported for a 5 x 2.5 cm organic liquid scintillator NE-213 as a neutron detector after the spectrometer was systematically calibrated, using a new technique, to determine the parameters used in the unfolding programme. The angular distributions and the background contribution of the neutrons produced by the Van de Graaff generator were measured at three different angles (0o, 45o and 90o) under the same conditions as those used in the theoretical study. A small neutron spectrometer was designed and constructed, using a 1 x 1 cm organic liquid scintillator cell and a new photomultiplier tube which approximately matches the small cell cross-section. This detector was tested and its gain measured experimentally at two different voltages. The results showed good discrimination between short (gamma-ray) and long (neutron) pulses, but the gain was not large enough for accurate calibration. The theoretical results showed good agreement with the experimental measurements and with previous work, but showed a small number of additional neutrons in the higher energy ranges. This occurred since the scattering angle of the incident deuteron in the target was allowed for in the computations. The dose equivalent of the neutron beam was computed from the experimental energy spectrum and was in good agreement with the result obtained under the same conditions using the neutron dosimeter.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available