Abstract
Ultrasound has been examined previously as an alternative readout method for irradiated polymer gel dosimeters, with authors reporting varying dose response to ultrasound transmission measurements. In this current work we extend previous work to measure the broadband ultrasound attenuation (BUA) response of irradiated PAGAT gel dosimeters, using a novel ultrasound computed tomography system.
Highlights
Ultrasound has been shown to have the potential to evaluate gel dosimeters due to changes in the measurement of velocity, attenuation and frequency dependent attenuation [1,2,3,4]
PAGAT gel preparation and irradiation A batch of PAGAT gel was manufactured based on the Venning et al [5] formulation with the THPC (Tetrakis Hyydroxymethyl Phosphonium Chloride) concentration increased to 8 mM [6] under normal atmospheric conditions
The broadband ultrasound attenuation (BUA) value was measured through four steps: 1. For each individual transmitted signal, the time-portion of signal which includes the maximum signal amplitude was extracted for both sample and reference
Summary
Ultrasound has been shown to have the potential to evaluate gel dosimeters due to changes in the measurement of velocity, attenuation and frequency dependent attenuation [1,2,3,4]. Imaging technique and data collection The ultrasound computed tomography (CT) system used to scan our samples comprises of two coaligned 5 MHz, 128 element linear-array transducers; one serving as transmitter, the other as receiver. The propagated ultrasound signal for detected by the corresponding co-aligned receive transducer element (Rn); T1-R1, T2-R2, ..T64-R64.
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