Co-doping effects in CdWO۴ scintillator thin film as alpha counters: Ag and Gd case

The flexible CdWO۴ (CWO)-۲۲Wt. % polyester (PES) and CWO: ۲۵۵:at. Ag, ۲۵۵:at. Gd (co-doped CWO)-۲۲Wt. % PES thin films were prepared by direct mixing technique. The composition of thin films was studied by EDAX analysis. FE-SEM and EDAX-map images exhibited a uniform distribution of CWO and codoped CWO nanoparticles (NPs) in PES. The precision of the Monte Carlo technique for the computation of alpha particle trajectories in CWO-۲۲Wt. % PES and co-doped CWO-۲۲Wt. % PES thin films were ۵۵ and۵۳ , respectively, which approximately agreed with FE-SEM images. The band gap energy of co-doped CWO increased based on DRS results. The scintillation responses of thin films were investigated using a ۲۴۱Am source. Co-doping increased the absolute counting efficiency (up to %۴:) and decreased the energy resolution (up to ۳۹:). These results indicate that the manufactured nanocomposites could be promising candidates for ionizing radiation detectors, radiometric monitoring, and light-emitting diodes (LEDs).

Keywords:

CWO , Band gap , Nanocomposite , Scintillation response , Absolute efficiency.