An Experimental and Theoretical Study of Embedded Scintillator Fiber Probes | #Sciencefather #Researcherawards

Introduction

Optical fiber radiation sensing probes incorporating inorganic scintillator materials have emerged as powerful tools for high-precision dose measurement in radiotherapy. Their miniaturized size, high spatial resolution, and excellent linearity make them ideal for integration into sensing arrays. This study explores both experimental and theoretical aspects of the coupling efficiency between scintillator luminescence and optical fibers. By developing a mathematical model that includes the effects of fiber numerical aperture and fluorescence self-absorption, the research presents a refined understanding of light transmission behavior within these composite structures, paving the way for improved probe design and optimization.

Theoretical Modeling of Scintillator Luminescence Coupling

A key contribution of this study lies in its establishment of a theoretical model describing the interaction between the scintillator and the optical fiber. The model accounts for luminescent photon generation, transmission efficiency, and losses due to internal reflection and self-absorption. By deriving a fluorescence intensity calculation formula, the work provides a predictive framework that can guide experimental design and parameter selection. Such theoretical modeling enables a quantitative understanding of how geometric and optical parameters influence the probe’s sensitivity and response linearity.

Numerical Simulation and Nonlinear Fitting Analysis

Through detailed numerical simulation, the relationship between scintillator length and light intensity response was analyzed under varying absorption coefficients. The results demonstrated nonlinear dependencies that could be well described by a fitting equation, introducing the novel concept of “effective length of scintillator.” This effective length represents the optimum region within which luminescence is efficiently coupled into the fiber, providing a valuable metric for future probe optimization and comparative analysis among different scintillator materials.

Experimental Fabrication of Optical Fiber Probes

Five optical fiber radiation probes were fabricated with scintillator lengths ranging from 0.2 mm to 2.0 mm using a 3:1 mass ratio mixture of UV-setting epoxy resin and Gd₂O₂S:Tb phosphor powder. The fabrication process emphasized precision alignment and consistent coupling to ensure reproducibility across the samples. The use of a UV-curable matrix provided excellent mechanical stability and light transparency, ensuring minimal signal attenuation during radiation testing. This meticulous experimental design validated the theoretical predictions with high reliability.

Validation and Determination of Effective Scintillator Length

Experimental testing was performed in a clinical radiation environment, revealing a strong correlation between measured and simulated data. The optimal effective scintillator length was determined to be approximately 0.62 mm, a value that balances light yield, signal-to-noise ratio, and spatial resolution. This finding demonstrates that longer scintillators are unnecessary and may even reduce probe efficiency. The validation of the theoretical model through empirical data reinforces its applicability to real-world radiation dosimetry systems.

Impact and Future Research Directions

This study’s introduction of the effective scintillator length concept provides a new design paradigm for optical fiber radiation probes. It enables material conservation, simplified fabrication, and improved imaging resolution. Future research can extend this model to alternative scintillator compositions, wavelength-selective coupling designs, and integration with real-time dosimetry systems. Moreover, the approach can be applied to multi-point sensing arrays for advanced radiotherapy monitoring, fostering innovation in medical physics and optical engineering.

Global Particle Physics Excellence Awards


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Hashtags

#Sciencefather, #Reseacherawards, #OpticalFiberRadiation, #ScintillatorMaterials, #FiberOpticSensors, #RadiationDosimetry, #MedicalPhysics, #LuminescenceCoupling, #EffectiveLength, #NumericalSimulation, #Gd2O2STb, #FluorescenceIntensity, #PrecisionRadiotherapy, #InorganicScintillators, #PhotonTransport, #FiberOpticProbes, #LightTransmission, #ProbeOptimization, #ExperimentalValidation, #RadiationMeasurement, #OpticalEngineering, #ResearchInnovation,

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