[15p-M_B07-1~7] Opening the Future of Decommissioning with Radiation Measurement Technologies: Challenges and Progress at Fukushima Daiichi Nuclear Power Station

2:00 PM - 2:30 PM JST(5:00 AM - 5:30 AM UTC)

[15p-M_B07-2] Development of new alpha particle detectors and their application to the Fukushima Daiichi Nuclear Power Station decommissioning site

〇Yuki Morishita¹ (1.JAEA)

Keywords:

Alpha particle detector,Dust monitor,Pulse shape discrimination (PSD)

In the decommissioning site of the Fukushima Daiichi Nuclear Power Plant, rapid and accurate identification of alpha contamination is essential under environments with mixed beta and gamma radiation. This study developed a novel alpha-ray detector using a two-layer scintillator and pulse shape discrimination (PSD) based on differences in scintillation decay times. The detector achieved high-precision discrimination between alpha and beta rays, and energy discrimination enabled the removal of radon progeny. Its effectiveness was demonstrated using contaminated smear samples and a continuous dust monitor, indicating strong potential for practical application in decommissioning sites.