Journal Article Development of a low-energy high resolution X-ray camera for high-energy gamma photon background environments

安藤, 昂輝(名古屋大学)  ,  山本, 誠一(名古屋大学)  ,  栗田, 圭輔  ,  鈴井, 伸郎  ,  尹, 永根  ,  石井, 里美  ,  河地, 有木

54 ( 9 )  , pp.933 - 939 , 2017-05 , Taylor and Francis
Although a high-energy gamma camera can obtain images of Cs-137 distribution by detecting the 662-keV gamma photons, its spatial resolution is reduced because high-energy gamma photons penetrate the edge of the pinhole collimator. To solve this problem, we developed a low-energy X-ray camera that detects the characteristic X-ray photons (32~37 keV) that are emitted from Cs-137 to obtain high resolution images. We used a 45- x 45- x 1-mm-thick NaI(Tl) scintillator that was encapsulated in 0.1-mm-thick aluminum and optically coupled to a 2-inch square, position sensitive photomultiplier tube (Hamamatsu Photonics, PSPMT:H12700 MOD) as a imaging detector. The imaging detector was encased in a 2-cm-thick tungsten alloy container and a pinhole collimator was attached to its camera head. The spatial resolution and sensitivity were ~5-mm FWHM and ~0.6 cps/MBq for the 1.5-mm pinhole collimator 10 cm from the collimator surface, respectively. We administered 5MBq of Cs-137 to a soybean seedling, imaged the distribution of radionuclides for six hours, and successfully obtained a high resolution image of it with our developed X-ray camera. We believe our camera will be a powerful tool for such Cs-137 imaging in plants.

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