title: Measurement of ultrasonic attenuation coefficient in polymer gel dosimeters.
abstract: A technique is described for investigation of the ultrasonic attenuation coefficient for evaluation of absorbed dose in polymer gel dosimeters. Using this technique the attenuation coefficient as a function of absorbed dose in PAG and MAGIC polymer gel dosimeters was measured. The ultrasonic attenuation coefficient dose sensitivity for PAG was found to be 2.9 +/- 0.3 dB m(-1) Gy(-1) and for MAGIC gel 4.2 +/- 0.3 dB m(-1) Gy(-1). Unlike previous studies of ultrasonic attenuation in polymer gel dosimeters this technique enables a direct measure of the attenuation coefficient.
authors: School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Australia.
authors: Melissa L
authors: ML
authors: Mather
authors: Paul H
authors: PH
authors: Charles
authors: Clive
authors: C
authors: Baldock
mesh_terms: D003720:Densitometry / Q000379:methods; D005782:Gels / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011874:Radiometry / Q000379:methods; D014465:Ultrasonics
chemical_list: D005782:Gels; D011108:Polymers