Systematic variations in polymer gel dosimeter calibration due to container influence and deviations from water equivalence
| Autor: | M. Taylor, R M Millar, Peter N. Johnston, Rick Franich, Jamie Trapp |
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| Rok vydání: | 2007 |
| Předmět: |
Photons
Dosimeter Materials science Radiological and Ultrasound Technology Phantoms Imaging Polymers Monte Carlo method Reproducibility of Results Water Mechanics Models Theoretical Imaging phantom Mockup Calibration Measuring instrument Radiology Nuclear Medicine and imaging Coaxial Radiometry Gels Monte Carlo Method Beam (structure) Simulation |
| Zdroj: | Physics in medicine and biology. 52(13) |
| ISSN: | 0031-9155 |
| Popis: | There are a number of gel dosimeter calibration methods in contemporary usage. The present study is a detailed Monte Carlo investigation into the accuracy of several calibration techniques. Results show that for most arrangements the dose to gel accurately reflects the dose to water, with the most accurate method involving the use of a large diameter flask of gel into which multiple small fields of varying dose are directed. The least accurate method was found to be that of a long test tube in a water phantom, coaxial with the beam. The large flask method is also the most straightforward and least likely to introduce errors during the set-up, though, to its detriment, the volume of gel required is much more than other methods. |
| Databáze: | OpenAIRE |
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