Abstract
Radiochromic film is used extensively in many medical, industrial, and scientific applications. In particular, the film is used in analysis of proton generation and in high intensity laser-plasma experiments where very high dose levels can be obtained. The present study reports calibration of the dose response of Gafchromic EBT3 and HD-V2 radiochromic films up to high exposure densities. A 2D scanning confocal densitometer system is employed to carry out accurate optical density measurements up to optical density 5 on the exposed films at the peak spectral absorption wavelengths. Various wavelengths from 400 to 740 nm are also scanned to extend the practical dose range of such films by measuring the response at wavelengths removed from the peak response wavelengths. Calibration curves for the optical density versus exposure dose are determined and can be used for quantitative evaluation of measured doses based on the measured optical densities. It was found that blue and UV wavelengths allowed the largest dynamic range though at some trade-off with overall accuracy.
Highlights
Radiochromic film (RCF) is used extensively to measure radiation dose in many medical,1,2 industrial,3,4 and scientific5–9 applications
This has been extended into the UV scanning range in Ref. 17 where additional dynamic range was obtained for HD810, a previous version of radiochromic film
At OD 4.9, the optical density was accurate to 0.7% and the light intensity measured by the scanner was accurate to 8%
Summary
Radiochromic film (RCF) is used extensively to measure radiation dose in many medical, industrial, and scientific applications. The characteristics of the film change with the introduction of new types of radiochromic film by manufacturers Calibrations of these new film types are required in order to apply these films for quantitative dose calculations. One can scan the film in spectral regions away from the peak density response of the film, allowing measurements over a larger dose range at lower optical densities. Such a strategy has been demonstrated in previous reports where multi-color analysis has been employed for high dose irradiation in Refs. This has been extended into the UV scanning range in Ref. 17 where additional dynamic range was obtained for HD810, a previous version of radiochromic film
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