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Multi-Pixel Photon Counter (MPPC) is a solid state photon counting device consisting of Geiger-mode APD pixels and self-quenching resistors. The MPPC has attractive features, such as low bias voltage operation, high gain, compact size, robustness and insensitivity to magnetic fields. Therefore, MPPC applications are now being expanded, especially for very low light level measurements. We have developed...
Gamma ray cameras can easily locate radiation hotspots where decontamination is required. Among them, the Compton camera that utilizes the Compton scattering is compact and lightweight because no radiation shielding is required. We have developed a Compton camera for quick visualization of the radioactive contamination. It features high detection efficiency by utilizing gamma ray detectors which is...
With the aim of clarifying the origin of local defects in coated conductors (CCs) and feeding back to the fabrication process, we have examined the distribution of defects in each layer of a CC which has Ag/GdBCO/CeO2/LaMnO3(LMO)/IBAD -MgO/Gd2Zr2O7(GZO)/Hastelloy structure by means of a high-speed scanning laser observation system. The system detects anomalies in height of the surface and reflectivity...
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