Dependence of radiochromic film response kinetics on fractionated doses.
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.
Ali
I
I
Department of Radiation Oncology, Virginia Commonwealth University, P.O. Box 980058, Richmond, VA 23298, USA. iali@vcu.edu
Williamson
J F
JF
Costescu
C
C
Dempsey
J F
JF
D001918:Brachytherapy / Q000379:methods*; D019583:Dose Fractionation, Radiation; D011874:Radiometry / Q000379:methods* / Q000592:standards; D015203:Reproducibility of Results; D014962:X-Ray Film