Studies on Photon Interaction Parameters of Some Fluorescent Molecules

• Published in: Journal of electronic materials 2024-12, Vol.53 (12), p.7409-7418
• Main Authors: Shivaleela, B., Manohara, S. R., Kalgi, Mayadevi, Shivraj, G. G., Hanagodimath, S. M.
• Format: Article
• Language: English
• Subjects: 28th International Conference on Nuclear Tracks and Radiation Measurements; Absorption; Atomic properties; Attenuation coefficients; Characterization and Evaluation of Materials; Chemical compounds; Chemistry and Materials Science; Elastic scattering; Electron density; Electronics and Microelectronics; Energy; Fluorescence; Instrumentation; Interaction parameters; Materials Science; Optical and Electronic Materials; Pair production; Pharmacology; Photoelectricity; Photons; Solid State Physics
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-024-11424-y

In the interaction of photons using the WinXCom program, the parameters for the three fluorescent molecules, 5NFMOT, 4ATMBC, and 4ATMMC, the effective atomic number ( Z eff ), and electron density ( N el ), have been determined for the energy range of 1–100 GeV using mass attenuation coefficients. The variation of μ / ρ , Z eff , and N el values for the energies are graphically depicted for different photon interactions. The variation of both parameters, Z eff and N el , with energy is the same. The significant fluctuation in Z eff and N el can be attributed to the prevalence of several interaction mechanisms within that energy range. For example, photoelectric absorption takes place at energies lower than 0.01 MeV. Pair formation steadily rises and achieves a constant value at energies above 100 MeV, while Compton scattering starts at 0.01 MeV and continues until it reaches 0.05 MeV. Additionally, kerma ( k a ) values for a range of energies between 1 keV and 20 MeV have been found. Photoelectric absorption for kerma ( k a ) seems to be the predominant interaction method for fluorescent compounds. There are biological and therapeutic uses for these Z eff , N el , and k a values. Graphical Abstract In the wide energy region, variation of photon interaction parameters with energies has been explained. The presence of several interaction modes in that energy range accounts for the significant variation in Z eff . The primary process of interaction at low energy, or at E   100 MeV. The absorption peak shown by kerma values in the energy range has been detected at 80 keV, where the primary interaction process seems to be photoelectric absorption.