Development of the transparent, lightweight and flexible radiation detector and real-time imaging of the two-dimensional dose distribution

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K08036
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 52040:Radiological sciences-related
• Research Institution: Tokyo Denki University
• Principal Investigator: Ishii Satoshi 東京電機大学, 理工学部, 准教授 (90442730)
• Co-Investigator(Kenkyū-buntansha): 足立 直也 東京電機大学, 理工学部, 准教授 (30553515) ; 小西 輝昭 国立研究開発法人量子科学技術研究開発機構, 量子生命科学領域, グループリーダー(定常) (70443067)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 放射線検出器 / ２次元イメージング

Outline of Final Research Achievements

The transparent and flexible array of 3×3 X-ray detectors was fabricated on the surface of a plastic substrate by using a pentacene thin film as the detector and a carbon nanotube thin film as the electrode. The X-ray current generated by each detector was simultaneously measured in real time while the detector array was irradiated with X-rays with an effective energy of 83 keV and a dose rate of 0 to 30.05 mGy/s. Based on the theoretical and experimental results, the X-ray current was converted into the dose rates, and the dose rate at the location of each detector was visualized as a two-dimensional distribution, demonstrating the radiation imaging capability of the present detector array.

Free Research Field

機能性デバイス

Academic Significance and Societal Importance of the Research Achievements

本研究成果の学術的意義は透明でフレキシブルな放射線検出器を作製できたうえに，印加電圧が1 Vと低いにもかかわらず，0.78 mGy/sの低線量率までX線をリアルタイムで検出できた点にある．これは小型かつ省電力でのX線検出が可能であることを示しており，今後のウェアラブル検出器の開発に向けた足掛かりを得たことになる．また，本成果を発展させて放射線のリアルタイムイメージングを実現できれば，水晶体のリアルタイム線量率測定の普及により放射線診療従事者の安全が確保できる．さらに，患者の症状や人数に対して治療者の正確な積算被爆線量に基づいた最適な人員配置ができるため，その社会的意義は大きい．