The Utilization of Hyper-Thermal Neutrons for Neutron Capture Therapy
It is very important for Neutron Capture Therapy (NCT) to get a sufficient thermal neutron flux at the tumor part without exceeding the tolerance dose in normal tissue. In the current thermal neutron irradiation for NCT, it is difficult to obtain the sufficient thermal neutron flux in a patient with deep-seated tumor. That is because the thermal neutron flux decreases rapidly in human tissue, which mainly consists of water, through absorption and scatter by hydrogen atoms. The limit of treatable depth for tumor is dependent on some clinical conditions such as the concentration of NCT agent in tumor, the size of irradiation field etc.. From the clinical experience in Japan, the depth of 5 cm from the surface is a criterion for the application of the NCT with the thermal neutron irradiation at the present time.
KeywordsNeutron Spectrum Boron Neutron Capture Therapy Thermal Neutron Flux Absorb Dose Rate Beryllium Oxide
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