Preliminary investigation of a luminescent colloidal quantum dots-based liquid scintillator

9th International Conference on 3D Radiation Dosimetry

Delage, Marie-Ève^1,2 ; Lecavalier, Marie-Ève^3 ; Larivière, Dominic^3 ; Allen, Claudine Nì^4 ; Beaulieu, Luc^1,2

Département de Physique, De Génie Physique et d'Optique et Centre de Recherche sur le Cancer, UniversitéLaval, QC, Canada^1

Centre de Recherche du CHU de Québec, Université Laval, QC, Canada^2

Laboratoire de Radioécologie, Département de Chimie, Université Laval, QC, Canada^3

Département de Physique, De Génie Physique et d'Optique, Centre d'Optique, Photonique et Laser (COPL), Université Laval, QC, Canada^4

关键词: Colloidal quantum dots;    Concentration dependence;    Liquid scintillator;    Luminescent nanocrystals;    Radiation detection;    Radio-luminescence;    Ultra low concentration;    X ray radiation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/847/1/012043/pdf
DOI  :  10.1088/1742-6596/847/1/012043

来源: IOP

【 摘 要 】

Nanoparticles are appealing materials because of their versatility in addition to the uniqueness of their properties enabling one to use them in different applications. Radiation detection with colloidal quantum dots (cQDs) is one of the domains where the nanoscience entered lately. The luminescent nanocrystals that are cQDs are of particular interest in scintillation dosimetry, where they could play the role of the fluorophore in a liquid scintillator. The study presented in this paper investigates the response of a cQD-based liquid scintillator to X-ray radiation in order to characterize the dose and cQDs concentration dependence of the radioluminescence (RL) signal. For a beam energy of 180 kVp, the latter was found to be linear as a function of dose, with a majority of the signal (∼80%) coming from the cQDs and not the solvent, in this case hexane. Even with an ultra low concentration (μM), cQDs emit sufficient light to be detected. The RL intensity followed also a linear trend as a function of cQDs concentration, independently of the exposure time.