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Fundamental characteristics of a new plastic scintillation fiber (PSF) has been studied for four kinds of radiations, and the possibility of using the PSF as a radiation detector has been discussed. Irradiation experiments of scintillation output characteristics have been made for γ rays, x rays, fast neutrons, and α particles. Various scintillation pulse height spectra have been obtained, depending on the variations of radiation types, energies, intensities, and scintillating positions on the PSF. Position detection experiments have been also made for γ rays and fast neutrons, and a new position sensitive detector of the PSF has been proposed.

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Pulsed neutron transmission spectroscopic radiography is an attractive new technique in energy-resolved neutron radiography. The imaging technique is based on the spectral analysis of neutrons through the time-of-flight (TOF) method. The neutron transmission spectrum that can be obtained using a time-resolved neutron imaging system includes the Bragg-scattering edges with crystallographic information and the transmission dips due to the resonance absorption of the nuclei. To obtain the neutron transmission spectrum with high-power neutron sources, we developed a new high-performance imaging system consisting of a neutron color image intensifier, photon image intensifier, high-resolution CMOS camera, and high-frame-rate camera. The system was used for experiments at the electron linac pulsed neutron source in Hokkaido University, and the targeted function was proved to be successful.