Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8589
Title: Dual-peak dose measurement for radiochromic films by a newly developed spectral microdensitometer
Authors: Lee, KY
Fung, KKL 
Kwok, CS
Keywords: Dual-peak dose measurement
Film dosimetry
Microdensitometer
Radiochromic film
Issue Date: 2005
Source: Medical physics, 2005, v. 32, no. 6, p. 1485-1490 How to cite?
Journal: Medical Physics 
Abstract: Radiochromic film (RCF) dosimetry is usually based on densitometric methods which use an analyzing light source of a fixed or a broad spectrum of wavelengths. These methods have not exploited the sensitivity of the dose response of the RCF otherwise attainable by using a light source with wavelengths peaked at the two absorption peaks in the absorption spectrum of the RCF. A new algorithm of dual-peak dose measurement for the RCF has been proposed in this paper to make use of these dual absorption peaks to achieve the maximum attainable sensitivity. This technique relies on the measurement of the transmittance of the RCF at the wavelength of the major and minor absorption peaks, respectively. The dual-peak dose measurement is accomplished with the aid of a novel spectral microdensitometer developed in our Institute. The microdensitometer utilizes a monochromator to provide a light source of which the wavelength can be matched precisely to the wavelength of the absorption peaks of the RCF. The doses obtained at these wavelengths are fed into a weighted objective function and an optimum dose is searched by minimizing the objective function to give the best estimate of the dose deposited on the film. An initial test shows that there is a good agreement between the estimated and actual dose deposited; and the maximum discrepancy was found to be less than 1%.
URI: http://hdl.handle.net/10397/8589
ISSN: 0094-2405
DOI: 10.1118/1.1914544
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