Simulation of X-ray fluorescence and K-edge absorption spectra using Geant4 code
The authors have developed the computational model of hybrid device for determining concentration of actinides in radioactive waste or process solutions using X-ray fluorescence analysis and X-ray densitometry. Prospects of this method is determined by the necessity of greater precision. The hybrid...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Tomsk Polytechnic University
2023-09-01
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| Series: | Известия Томского политехнического университета: Промышленная кибернетика |
| Subjects: | |
| Online Access: | https://indcyb.ru/journal/article/view/33/25 |
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| Summary: | The authors have developed the computational model of hybrid device for determining concentration of actinides in radioactive waste or process solutions using X-ray fluorescence analysis and X-ray densitometry. Prospects of this method is determined by the necessity of greater precision. The hybrid device consists of an X-ray tube, ionizing radiation detector and a sample. The model purpose is to gauge the viability of decisions being made during development and to highlight possible technical problems. Moreover, it allows getting spectrа from semiconductor and scintillation detectors. The model is developed using Geant4 – a platform for imitation modeling of ionizing radiation interaction with matter using the Monte-Carlo procedure. The cuvette material impact on the shape of spectrum was assessed using polystyrene, steel and quartz glass. The authors obtained the spectra of model solutions containing one of the elements (U, Np, Pu or Am) in nitric acid. It is noted that the resulting energy distributions are weakly discernible due to the proximity of K-edge absorption energies. In addition, spectra for uranyl nitrate solution in wide range of concentration were simulated. It was confirmed that X-ray fluorescence method is most promising for measuring low concentrations (up to 100 g/l). On the other side, K-edge densitometry shows better results for high concentrations (more than 100 g/l). Resulting response functions of detectors are "idealistic" because of model limitations. Only the impact of statistical fluctuation of the amount of charge carriers created in detector sensitive volume on detected energies of particles is taken into the account. |
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| ISSN: | 2949-5407 |