| 초록 |
Scintillators resolve gamma-ray by converting a high-energy photon to photomultiplier tube (PMT)-detectable low energy photons. Plastic scintillator is based on a polymer matrix where fluorescent scintillators are embedded. Considering the quantum efficiency of PMT, a wavelength shifter is required for matching the emission wavelength between the scintillator and the PMT. However, efficient energy transfer is hard to obtain because of the difficulty in distance control between the fluorescent scintillator and the wavelength shifter and in the miscibility difference in the matrix. A low molecular PPO was covalently bonded to a conjugated polymer (CP) used as a wavelength shifter. The PPO-CP showed a quantum yield of up to 62%, and was embedded in PVT to obtain a bulk plastic scintillator. The bulk scintillator showed a strong blue fluorescence with 68 % transmittance with a distinct energy spectrum in response to gamma-ray from radioactive nuclides, including C-14 and Sr-90. |
