Development of a low-toxicity water-equivalent liquid scintillator based on CdSe/ZnS quantum dots
10.3969/j.issn.1005-202X.2025.10.002
- VernacularTitle:基于CdSe/ZnS量子点的低毒水等效液体闪烁体的研制
- Author:
Xuegang CHU
1
;
Junhui WANG
;
Baoguo ZHANG
;
Xiaofen XING
Author Information
1. 山西省肿瘤医院/中国医学科学院肿瘤医院山西医院/山西医科大学附属肿瘤医院放疗科,山西 太原 030013
- Publication Type:Journal Article
- Keywords:
liquid scintillator;
quantum dot;
water-equivalent;
Geant4
- From:
Chinese Journal of Medical Physics
2025;42(10):1266-1272
- CountryChina
- Language:Chinese
-
Abstract:
Objective To develop a novel low-toxicity water-equivalent liquid scintillator with PPO as the primary luminescent substance,oil-soluble quantum dots(QD)as the secondary luminescent substance,and dodecylbenzene as the matrix.Methods The emission spectrum of PPO,as well as the absorption and emission spectra of QD were detected,and the radioluminescence tests were carried out on the scintillation liquids with different concentrations of QD as the secondary luminescent substance.After applying an empirical formula to deduce the approximate doping proportion of QD required for the tissue-equivalent liquid scintillator,the Monte Carlo simulation software Geant4 was used to accurately simulate the precise QD doping ratio,and finally,tests were conducted to evaluate the water equivalence and various dosimetric properties.Results The peak emission wavelength of PPO was 366 nm.For QD,the peak excitation wavelength was 340 nm,and the peak emission wavelength was 519 nm.Notably,the water equivalence was optimal when the QD doping concentration was 0.34 wt%.Conclusion QD can serve as the secondary luminescent substance for liquid scintillator,and the doping content of QD required to achieve water equivalent can be determined through Monte Carlo simulation.
