@misc{oai:repo.qst.go.jp:00064819,
 author = {Inadama, Naoko and Hirano, Yoshiyuki and Nishikido, Fumihiko and Murayama, Hideo and Yoshida, Eiji and Tashima, Hideaki and Nitta, Munetaka and Ito, Hiroshi and Yamaya, Taiga and et.al and 稲玉 直子 and 平野 祥之 and 錦戸 文彦 and 村山 秀雄 and 吉田 英治 and 田島 英朗 and 新田 宗孝 and 伊藤 浩 and 山谷 泰賀},
 month = {Nov},
 note = {We have developed a 3-dimasional (3D) position sensitive radiation detector, X'tal cube, which is composed of a scintillation crystal block and multi-pixel photon counters (MPPCs). The crystal block is segmented 3 dimensionally into small cubes (3D segmentation) and scintillation light from a segment is detected by all MPPCs on each six surface of the crystal block. We succeeded to make the 3D segmentation inside of a monolithic scintillator block by laser processing technique. We found that utilizing the technique not only eliminates the difficulty of fabrication with small scintillator elements but also improves detector performance.
As a new trial, we fabricated the crystal block by stacking the scintillator plates which are segmented 2 dimensionally by the laser processing technique (2D segmentation) instead making the 3D segmentation. Plates also easy to handle and for the laser processing, 2D segmentation is much simple. In this study, we used the X'tal cube with the scintillator plates (Plate-XC) to understand character of the X'tal cube with the 3D segmented crystal block (3D-XC) by comparing their performance. In the 3D-XC, all boundaries between crystal segments are processed by laser, while in the Plate-XC, air gap makes the boundary in one direction. Performance was measured by irradiating 662 keV gamma-rays. Used scintillator was LYSO. The crystal segments were in dimensions of 2.0 mm x 2.0 mm x 2.0 mm. Results showed comparable performance in crystal identification performance and energy resolution, however, different scintillation light distribution: more restricted distribution for the Plate-XC., 2012 Nuclear Science Symposium, Medical Imaging Conference},
 title = {X'tal Cube Detector Composed of a Stack of Scintillator Plates Segmented by Laser Processing},
 year = {2012}
}