Monte Carlo modelling of 90Sr/90Y and 85Kr beta fields for Hp(3) measurements
| Autor: | L. G. Hager, P. J. Gilvin, S. T. Baker, Richard Tanner, N. J. Gibbens, Jon Eakins |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Field (physics) Monte Carlo method Electrons Electron Eye Radiation Dosage Thermoluminescence Flattening Ionizing radiation law.invention Radiation Protection law Humans Radiology Nuclear Medicine and imaging Computer Simulation Yttrium Radioisotopes Photons Radiation Models Statistical Radiological and Ultrasound Technology Phantoms Imaging Public Health Environmental and Occupational Health Krypton Radioisotopes General Medicine Computational physics Lens (optics) Strontium Radioisotopes Monte Carlo Method Beam (structure) Relative Biological Effectiveness |
| Zdroj: | Radiation protection dosimetry. 158(1) |
| ISSN: | 1742-3406 |
| Popis: | In support of research aimed at developing a thermoluminescence dosemeter capable of accurately measuring ionising radiation doses to the lens of the eye, Monte Carlo modelling of a standard beta exposure set-up has been performed. It was found that electrons with an energy distribution corresponding to the beta emission spectrum from (85)Kr deposit negligible doses at a depth of 3 mm in tissue, but doses from (90)Sr/(90)Y are significant; free in air and fluence-to-Hp(3,θ°) and -Hp(0.07,θ°) conversion coefficient data were found for this field for exposures at 0°, 30° and 60° angles of incidence, and the response characteristics of the new eye dosemeter were evaluated. It was shown that the results were not affected greatly by the shape of the calibration phantom. However, it was demonstrated that the presence of intermediating air and beam flattening filters hardens the energy distribution of the field at the point of test, relative to a raw (90)Sr/(90)Y source, and this impacts dose depositions. |
| Databáze: | OpenAIRE |
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