Leuco-crystal-violet micelle gel dosimeters: I. Influence of recipe components and potential sensitizers

Radiochromic leuco crystal violet (LCV) micelle gel dosimeters are promising three-dimensional radiation dosimeters because of their spatial stability and suitability for optical readout. The effects of surfactant type and surfactant concentration on dose sensitivity of LCV micelle gels are tested,...

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Bibliographic Details
Published in:Physics in medicine & biology 2015-06, Vol.60 (12), p.4665-4683
Main Authors: Nasr, A T, Alexander, K, Schreiner, L J, McAuley, K B
Format: Article
Language:English
Subjects:
3D dosimetry
Cetrimonium Compounds - chemistry
Dose-Response Relationship, Radiation
dosimeters
Ethylene Chlorohydrin - analogs & derivatives
Ethylene Chlorohydrin - chemistry
Gels - chemistry
Gentian Violet - chemistry
Hydrogen-Ion Concentration
leuco crystal violet
micelle gel
Micelles
Octoxynol - chemistry
Radiometry - methods
Rosaniline Dyes - chemistry
Surface-Active Agents - chemistry
Trichloroacetic Acid - chemistry
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Summary:Radiochromic leuco crystal violet (LCV) micelle gel dosimeters are promising three-dimensional radiation dosimeters because of their spatial stability and suitability for optical readout. The effects of surfactant type and surfactant concentration on dose sensitivity of LCV micelle gels are tested, demonstrating that dose sensitivity and initial colour of the gel increases with increasing Triton x-100 (Tx100) concentration. Using Cetyl Trimethyl Ammonium Bromide (CTAB) in place of Tx100 produces gels that are nearly colourless prior to irradiation, but reduces the dose sensitivity. The separate effects of Tri-chloro acetic acid concentration and pH are investigated, revealing that controlling the pH near 3.6 is crucial for achieving high dose sensitivity. The sensitizing effect of chlorinated species on dose sensitivity is tested using 2,2,2-trichloroethanol (TCE), chloroform, and 1,1,1-trichloro-2-methyl-2-propanol hemihydrate. TCE gives the largest improvement in dose sensitivity and is recommended for use in micelle gel dosimeters because it is less volatile and safer to use than chloroform. Preliminary experiments on a new gel containing CTAB as the surfactant and TCE show that this new gel gives a dose sensitivity that is 24% higher than that of previous LCV micelle gels and is nearly colourless prior to irradiation.
ISSN:0031-9155
1361-6560
DOI:10.1088/0031-9155/60/12/4665