Description
Reliable absorbed-dose determination is fundamental to electron-beam radiation processing because dose controls the magnitude and reproducibility of radiation-induced physical, chemical and biological effects. This study presents an expanded analysis of experimental dosimetry data obtained during the training course “Multipurpose Irradiation Centre: Agricultural and Medical Applications” at Ural Federal University, Russia. Radiochromic-film optical-density measurements were recorded at calibrated absorbed doses of 5, 10, 15, 20 and 25 kGy while conveyor speed was varied from 4.0 to 0.8 m min^(-1). The analysis examines both film response and the theoretically expected inverse relationship between absorbed dose and conveyor speed. Regression of dose against inverse speed produced D = 20.710(1/v) -0.261, with R^2= 0.9904, while a physically constrained zero-intercept model yielded D = 20.418/v with R^2 = 0.9901. Graphical diagnostics confirm that conveyor residence time provides a highly consistent description of dose delivery under the reported operating conditions. In contrast, optical density was non-monotonic, particularly between 10 and 15 kGy, giving a weak global linear response (R^2 = 0.5804). The optical-density measurements therefore require repeat irradiation and standardized readout before adoption as a definitive calibration curve. The study demonstrates the value of combining process-parameter modeling, radiochromic-film measurements, residual diagnostics and uncertainty analysis for electron-beam facility characterization.
Keywords: electron beam; dosimetry; radiochromic film; optical density; absorbed dose; conveyor speed; irradiation facility; radiation processing
| Title | Radiochromic-Film Dosimetry Calibration and Dose-Speed Dependence in an Electron-Beam Irradiation Facility |
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