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Ultrasonic absorption in polymer gel dosimeters

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/193623

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Title: Ultrasonic absorption in polymer gel dosimeters
Related: Ultrasonics, Vol. 41, No. 7, (2003), p.551-559
DOI: 10.1016/S0041-624X(03)00153-7
Publisher: Elsevier
Date: 2003
Author/Creator: Mather, Melissa L
Author/Creator: Collings, Anthony F
Author/Creator: Bajenov, Nick
Author/Creator: Whittaker, Andrew K
Author/Creator: Baldock, Clive
Description: Ultrasonic absorption in polymer gel dosimeters was investigated. An ultrasonic interferometer was used to study the frequency (f) dependence of the absorption coefficient (α) in a polyacrylamide gel dosimeter (PAG) in the frequency range 5-20 MHz. The frequency dependence of ultrasonic absorption deviated from that of an ideal viscous fluid. The presence of relaxation mechanisms was evidenced by the frequency dependence of α/f2 and the dispersion in ultrasonic velocity. It was concluded that absorption in polymer gel dosimeters is due to a number of relaxation processes which may include polymer-solvent interactions as well as relaxation due to motion of polymer side groups. The dependence of ultrasonic absorption on absorbed dose and formulation was also investigated in polymer gel dosimeters as a function of pH and chemical composition. Changes in dosimeter pH and chemical composition resulted in a variation in ultrasonic dose response curves. The observed dependence on pH was considered to be due to pH induced modifications in the radiation yield while changes in chemical composition resulted in differences in polymerisation kinetics.
Description: 9 page(s)
Subject Keyword: Polymer gel dosimeter
Subject Keyword: Radiation dosimetry
Subject Keyword: Ultrasonic absorption
Subject Keyword: Ultrasonic attenuation
Subject Keyword: Ultrasonic relaxation
Resource Type: journal article
Organisation: Macquarie University. Faculty of Science

Identifier: http://hdl.handle.net/1959.14/193623
Identifier: ISSN:0041-624X
Identifier: mq_res-ext-2-s2.0-0043124238
Language: eng
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