Presentation Information
[25p-12E-4]Development of an ultrahigh resolution real time alpha particle imaging system for observing the trajectories of alpha particles
〇Seiichi Yamamoto1, Masao Yoshino2, Key Kamada2, Akira Yoshikawa2, Kohei Nakanishi3, Jun Kataoka1 (1.Waseda Univ, 2.Tohoku Univ, 3.Nagoya Univ)
Keywords:
alpha particle,imaging,ultrahigh resolution
High-resolution imaging of alpha particles is required in the detection of alpha radionuclides in cells or small organs for the development of radio-compounds for targeted alpha-particle therapy or other purposes. We developed an ultrahigh resolution, real time alpha-particle imaging system for observing the trajectories of alpha particles in a scintillator. The developed system is based on a magnifying unit and a cooled electron multiplying charge-coupled device (EM-CCD) camera, combined with a 100-µm-thick Ce-doped GAGG scintillator plate. Alpha particles from an Am-241 source were irradiated to the GAGG scintillator and imaged with the system. Using our system, we measured the trajectories of the alpha particles having different shapes in real time. In some of these measured trajectories, the line shapes of the alpha particles that flew in the GAGG scintillator were clearly observed. The lateral profiles of the alpha-particle trajectories were imaged with widths of less than 2 µm. We conclude that the developed imaging system is promising for research on targeted alpha-particle therapy or other alpha particle detections that require high spatial resolution. In the conference, we will also show the energy distributions, depth profiles and quenching measured by the developed system.