Preliminary investigations into the use of a functionalised polymer to reduce diffusion in Fricke gel dosimeters

Smith, S., Masters, K.-S., Hosokawa, K., Blinco, J.P., Crowe, S.B., Kairn, T., & Trapp, J.V. (2015) Preliminary investigations into the use of a functionalised polymer to reduce diffusion in Fricke gel dosimeters. Medical Physics, 42(12), pp. 6798-6803.

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Abstract

Purpose

A modification of the existing PVA-​FX hydrogel has been made to investigate the use of a functionalised polymer in a Fricke gel dosimetry system to decrease Fe3+ diffusion.

Methods

The chelating agent, xylenol orange, was chem. bonded to the gelling agent, polyvinyl alc. (PVA) to create xylenol orange functionalised PVA (XO-​PVA)​. A gel was created from the XO-​PVA (20​% w​/v) with ferrous sulfate (0.4 mM) and sulfuric acid (50 mM)​.

Results

This resulted in an optical d. dose sensitivity of 0.014 Gy-​1, an auto-​oxidn. rate of 0.0005 h-​1, and a diffusion rate of 0.129 mm2 h-​1; an 8​% redn. compared to the original PVA-​FX gel, which in practical terms adds approx. 1 h to the time span between irradn. and accurate read-​out.

Conclusions

Because this initial method of chem. bonding xylenol orange to polyvinyl alc. has inherently low conversion, the improvement on existing gel systems is minimal when compared to the drawbacks. More efficient methods of functionalising polyvinyl alc. with xylenol orange must be developed for this system to gain clin. relevance.

Impact and interest:

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ID Code: 90563
Item Type: Journal Article
Refereed: Yes
DOI: 10.1118/1.4934827
ISSN: 0094-2405
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
Deposited On: 23 Nov 2015 02:09
Last Modified: 06 Sep 2016 03:15

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