Using a Scanner to Measure Absorbed Doses with Radiochromic Film Dosimeters
The article provides a sequence of steps for using RISØ calorimeters for calibration and subsequent use of B3 radiochromic film dosimeters (GEX corporation) and a scanner for measuring absorbed doses. Calibration was carried out with the help of electron beam accelerator in the range of absorbed doses of 3 – 40 kGy (measurement range of RISØ calorimeters).
In the course of the work, the following was carried out:
– calibration of B3 radiochromic dosimetry films using RISØ calorimeters;
– plotting a calibration curve for B3 radiochromic dosimetric films;
– calculation of approximation functions;
– development of a technique for using a flatbed scanner to measure absorbed doses;
– estimation of the measurement uncertainties of absorbed doses.
Accelerator operation parameters: scanning frequency of the accelerated electron beam – 5 Hz, pulse frequency – 120 Hz, electron energy – 5 MeV, electron beam current – 60 μA. The measurement error of the absorbed dose is 5.8 %.
A. Miller, P. Hargittai, and A. Kovacs, Radiation Physics and Chemistry 57, 679–685 (2000), https://doi.org/10.1016/S0969-806X(99)00507-1.
S. Devic, J. Seuntjens, E. Sham, E. B. Podgorsak, C. R. Schmidtlein, A. S. Kirov, and C. G. Soares, Medical physics 32, 2245–2253 (2005), https://doi.org/10.1118/1.1929253.
International Organization for Standardization, ISO/ASTM 51631:2020 Practice for use of calorimetric dosimetry systems for dose measurements and dosimetry system calibration in electron beams, Standard (International Organization for Standardization, Geneva, CH, Feb. 2020).
P. Sharpe and A. Miller, National Physical Laboratory. NPL Rep. CIRM 29 (2009).
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