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Dependence of radiochromic film response kinetics on fractionated doses.

Ali I, Williamson JF, Costescu C, Dempsey JF

Department of Radiation Oncology, Virginia Commonwealth University, P.O. Box 980058, Richmond, VA 23298, USA. iali@vcu.edu

Because the rate and magnitude of the post-exposure growth of the MD-55 radiochromic film (RCF) dosimeter response depends significantly on total dose, we have investigated the influence of fractionation and protracted dose delivery on optical density (OD) as a function of total dose and the exposure-to-densitometry time interval for a 633-nm scanning laser densitometer. Both measurements and models demonstrate that fractionation induces transient OD over responses, which can be as large as 20%, but rapidly dissipate within 24 h. However, the superposition model predicts 2-5% over responses that persist as long as 700 h.

Published 9 February 2005 in Appl Radiat Isot, 62(4): 609-17.
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