Dose measurements for neutron capture therapy

Dose measuring systems for Boron Neutron Capture Therapy(BNCT) of brain tumors were presented. The systems consist of a real-time monitoring system, an integral measuring system and a 10B concentration measuring system. The real-time monitoring with a small PN junction silicon detector made it possible to simultaneously measure a thermal neutron flux and gamma dose rate of a patient during neutron therapy. Another monitoring of dose equivalents of thermal neutrons and gamma-rays was performed with a BGO scintillation detector connected to an optical fiber. The exact neutron fluence and gamma dose were determined with the integral measurements of foils activation method and thermoluminescent dosimeters(TLD) after irradiation. Kerma doses of thermal neutrons and gamma-rays were also measured with the TLD at the same time. Preliminary measurements of 10B concentration in tissues and bloods of a patient were carried out by prompt gamma-ray spectroscopy. (author)