| Budget Amount *help |
¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2013: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
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| Outline of Final Research Achievements |
Generally, boron concentration is measured by the method of prompt gamma ray analysis in BNCT treatment. However, the information of boron concentration is not able to be obtained by this method during the treatment. It is desired to measure the boron concentration in real-time. Therefore, we propose the method using prompt gamma rays with the energy of 478 keV emitted by the reaction between boron-10 and thermal neutron. There are some agendas, which should be overcome in order to apply a prompt gamma rays imaging detector in BNCT irradiation field. Most important agenda is the discrimination from 511 keV annihilation gamma ray as back-ground. The energy resolution of less than 6.5 % FWHM at 511 keV is needed in order to discriminate 511 keV gamma ray.
We constructed a prompt gamma rays imaging detector consisting of LaBr3(Ce) scintillator, 8 x 8 MPPC arrays, 64 channel channels amplifier and ADC. It was confirmed that this system was able to discriminate 511 keV gamma ray.
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