Evaluation of 3-D Polymer Gel Dosimeters of Ultrasound Computed Tomography and Dynamic Mechanical Analyzer on Ultrasonic Attenuation and Speed of Propagation and Storage Modulus
| Autor: | CHANG, CINA-HSIN, 張家鑫 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 The sensitivity of polymer gel dosimeter is high in radiation detection, which will be polymerized or cross-linked under the radiation exposure. The new NIPAM polymer gel dosimeter changes in the ultrasonic echo signals at different radiation dose. Set ultrasonic measurement system device, for tuning and system integration, to find out the optimum operating frequency and parameters, calculation and correction of NIPAM polymer gel dosimeter attenuation coefficient.The storage modulus of DMA was 2.24X10-3 MPa in 0Gy, 3.22X10-3 MPa in 5Gy, 4.01X10-3 MPa in 10Gy, 5.86X10-3 MPa in 15Gy. The ultrasonic attenuation of UCT was 0.76dB in 0Gy,1.31 dB in 5Gy, 2.22 dB in 10Gy,3.4 dB in 15Gy. The ultrasonic speeds of gel dosimeters in UCT were 1786 m/s in 0Gy, 1754 m/s in 5Gy, 1717 m/s in 10Gy, 1675 m/s in 15Gy. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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