Journal of Instrumentation · 2014 · 53 citations · 15 references
Photonic SensorField TestsEngineering3-D Position-sensitive ScintillatorsImage SensorCalibrationPhoton-counting Computed TomographyInstrumentationRadiation ImagingNuclear MedicineRadiologyHealth SciencesPhotonicsRadiation DetectionHandheld Compton CameraScintillatorGamma RaysCosmic RayRadiographic ImagingPhoton StatisticRadiation DecontaminationOptical SensorsMppc Arrays
After the nuclear disaster in Fukushima, radiation decontamination has become particularly urgent. To help identify radiation hotspots and ensure effective decontamination operation, we have developed a novel Compton camera based on Ce-doped Gd3Al2Ga3O12 scintillators and multi-pixel photon counter (MPPC) arrays. Even though its sensitivity is several times better than that of other cameras being tested in Fukushima, we introduce a depth-of-interaction (DOI) method to further improve the angular resolution. For gamma rays, the DOI information, in addition to 2-D position, is obtained by measuring the pulse-height ratio of the MPPC arrays coupled to ends of the scintillator. We present the detailed performance and results of various field tests conducted in Fukushima with the prototype 2-D and DOI Compton cameras. Moreover, we demonstrate stereo measurement of gamma rays that enables measurement of not only direction but also approximate distance to radioactive hotspots.
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R. W. Todd, J.M. Nightingale, Delora Everett · Nature · 1974 · 324 citations