Design optimization of a 1-D array of stemless plastic scintillation detectors

作     者：Aynehband, Samaneh Hill, Ian G. Syme, Alasdair 

作者机构：Dalhousie Univ Dept Phys & Atmospher Sci 5820 Univ AveDickson BldgRm 3030 Halifax NS B3H 1V7 Canada Dalhousie Univ Dept Radiat Oncol Halifax NS Canada Nova Scotia Hlth Author QEII Hlth Sci Ctr Dept Med Phys Halifax NS Canada 

出 版 物：《MEDICAL PHYSICS》 (Med. Phys.)

年 卷 期：2025年第52卷第4期

页      面：2560-2569页

核心收录：

学科分类：1001[医学-基础医学(可授医学、理学学位)] 1009[医学-特种医学] 10[医学] 

基　　金：Natural Sciences and Engineering Research Council of Canada [RGPIN2021-03715] Natural Sciences and Engineering Research Council of Canada (NSERC) NSERC Green Electronics Network 

主　　题：organic detector radiation scintillator small-field dosimetry stemless plastic scintillation detector 

摘      要：BackgroundA stemless plastic scintillation detector (SPSD) is composed of an organic plastic scintillator coupled to an organic photodiode. Previous research has shown that SPSDs are ideally suited to challenging dosimetry measurements such as output factors and profiles in small fields. Lacking from the current literature is a systematic effort to optimize the performance of the photodiode component of the detector. An optimized detector could permit a reduction in detector element size, thus improving spatial resolution without degradation of the signal to noise ratio values seen *** use an organic photodiode coupled to a plastic scintillator to measure ionizing radiation fields. The design retains the benefits of plastic scintillation detectors (energy and dose rate independence, no perturbation factors, etc.) but avoids the challenges of optical fiber-based systems (Cerenkov radiation). In this work, the design of a 1-dimensional array of SPSDs is optimized to maximize the measured ***-covered PET was etched using hydrochloric acid, and the substrate was cleaned. PEDOT: PSS and P3HT: PCBM (different weight ratios) were then applied to the substrate using spin-coating. Finally, aluminum top electrodes were added using vacuum thermal evaporation to complete the fabrication process. The variables studied for the optimization included: spin coater s speed (i.e., film thickness), P3HT: PCBM ratio, solution concentration, and scintillator *** the film thickness from similar to 80 nm to similar to 138 nm increased the measured signal by a factor of approximately 7.7. Changing the ratio of P3HT to PCBM from (1:1) to (4:1) resulted in approximately 3.5 times higher signal. Additionally, increasing the total concentration of the solution from 2% to 4% by weight ratio increased the signal by roughly a factor of 2.5 for a P3HT: PCBM ratio of 2:1. However, for a P3HT: PCBM ratio of 4:1, increased solution concentration