Leuco-crystal-violet micelle gel dosimeters: Component effects on dose-rate dependence

9th International Conference on 3D Radiation Dosimetry

Xie, J.C.^1 ; Katz, E.A.B.^1 ; Alexander, K.M.^2 ; Schreiner, L.J.^2,3 ; McAuley, K.B.^1

Dept. Chemical Engineering, Queen's University, Kingston

K7L 3N6, Canada^1

Dept. of Physics, Queen's University, Kingston

ON

K7L 3N6, Canada^2

Cancer Centre of Southeastern Ontario, Kingston

K7L 5P9, Canada^3

关键词: 2 ,2 ,2-trichloroethanol;    Cetyltrimethylammonium bromide;    Component effect;    Designed experiments;    Dose rate dependence;    Dose sensitivity;    High sensitivity;    Optimization procedures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/847/1/012041/pdf
DOI  :  10.1088/1742-6596/847/1/012041

来源: IOP

【 摘 要 】

Designed experiments were performed to produce empirical models for the dose sensitivity, initial absorbance, and dose-rate dependence respectively for leucocrystal violet (LCV) micelle gel dosimeters containing cetyltrimethylammonium bromide (CTAB) and 2,2,2-trichloroethanol (TCE). Previous gels of this type showed dose-rate dependent behaviour, producing an ∼18% increase in dose sensitivity between dose rates of 100 and 600 cGy min-1. Our models predict that the dose rate dependence can be reduced by increasing the concentration of TCE, CTAB and LCV. Increasing concentrations of LCV and CTAB produces a significant increase in dose sensitivity with a corresponding increase in initial absorbance. An optimization procedure was used to determine a nearly dose-rate independent gel which maintained high sensitivity and low initial absorbance. This gel which contains 33 mM CTAB, 1.25 mM LCV, and 96 mM TCE in 25 mM trichloroacetic acid and 4 wt% gelatin showed an increase in dose sensitivity of only 4% between dose rates of 100 and 600 cGy min-1, and provides an 80% greater dose sensitivity compared to Jordan's standard gels with similar initial absorbance.