8-12 July 2013
Comparison of neutron fluence spectra measured with NE213 proton recoil spectrometer and NE230 deuteron recoil spectrometer
Presented by Mr. vusumuzi MASONDO on 12 Jul 2013 from 10:30 to 10:50
Type: Oral Presentation
Track: Track B - Nuclear, Particle and Radiation Physics
Measurements and detail knowledge of neutron fluence spectra are required in research and application. In application such as neutron radiotherapy, neutron fluence spectra in and near the treatment area is required for characterization of the quality of radiation and determination of absorbed dose. These fluence spectra can be measured or calculated. Recoil spectrometry with time of flight is used to measure the fluence spectra; in particular the NE213 proton recoil spectrometer with time of flight is used widely and is well established. However, in water phantom (a simulation of a human tissue) recoil protons from the water causes distortions in the measured fluence spectra, a way to overcome this is to use a deuterated organic liquid scintillator NE230 which is based on deuteron recoil. Experiments were carried out at the neutron beam facility at iThemba LABS in Cape Town. Neutron beams of energies up to ~64MEV were produced by bombarding either Li (1.0mm), Be (10.0mm), or C (10.0mm) targets with 66MeV protons from the separated sector cyclotron. Neutron fluence measurements were carried out separately with either NE213 or NE230 scintillation detectors, using time of flight methods. Preliminary results will be presented and discussed.
Dr M.S. Herbert, email@example.com, department of physics, University of the Western Cape