Range and light output measurements of trajectory images in a GAGG plate with different alpha particle energies

• Published in: Journal of instrumentation 2024-01, Vol.19 (1), p.P01010
• Main Authors: Yamamoto, Seiichi, Yoshino, Masao, Nakanishi, Kohei, Kamada, Kei, Yoshikawa, Akira, Kataoka, Jun
• Format: Article
• Language: English
• Subjects: Alpha particles; Alpha rays; Americium; Americium 241; Charge coupled devices; Detector control systems (detector and experiment monitoring and slow-control systems, architecture, hardware, algorithms, databases); Energy levels; Heavy-ion detectors; Mylar; Particle tracking detectors; Scintillation counters; Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators); Trajectory analysis; Trajectory measurement
• ISSN: 1748-0221; 1748-0221
• DOI: 10.1088/1748-0221/19/01/P01010

An imaging method that utilizes a scintillator plate combined with a magnifying unit and a cooled electron multiplying charge-coupled device (EM-CCD) camera shows promise for obtaining high-resolution trajectory images. However, it is not yet clear whether the ranges of the trajectory images change with the energy of the alpha particles. Additionally, it remains unclear whether the intensity of the trajectory images is affected by the energy of the alpha particles. To address these questions in our trajectory imaging research, we conducted experiments to capture trajectory images of alpha particles with varying energy levels. To generate alpha particles with different energies, we modulated the energy using an americium-241 (Am-241) source covered with varying numbers of Mylar films. With this alpha source and imaging system, we successfully captured trajectory images with different alpha particle energies and were able to assess the ranges and intensities of these trajectories at various energy levels. The estimated ranges from the measured images with different alpha particle energies closely matched the results obtained through simulations. However, it's worth noting that the light output, as evaluated for the measured trajectory images, was slightly lower than the simulated results at lower energy levels probably due to the non-proportionality of the GAGG plate with respect to alpha particle energies.