Radiological characterization and water equivalency of genipin gel for x-ray and electron beam dosimetry

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dc.contributor.authorGorjiara, Ten_AU
dc.contributor.authorHill, Ren_AU
dc.contributor.authorKuncic, Zen_AU
dc.contributor.authorBosi, SGen_AU
dc.contributor.authorDavies, JBen_AU
dc.contributor.authorBaldock, Cen_AU
dc.date.accessioned2013-11-25T23:31:40Zen_AU
dc.date.available2013-11-25T23:31:40Zen_AU
dc.date.issued2011-08-07en_AU
dc.date.statistics2013-11-26en_AU
dc.description.abstractThe genipin radiochromic gel offers enormous potential as a three-dimensional dosimeter in advanced radiotherapy techniques. We have used several methods (including Monte Carlo simulation), to investigate the water equivalency of genipin gel by characterizing its radiological properties, including mass and electron densities, photon interaction cross sections, mass energy absorption coefficient, effective atomic number, collisional, radiative and total mass stopping powers and electron mass scattering power. Depth doses were also calculated for clinical kilovoltage and megavoltage x-ray beams as well as megavoltage electron beams. The mass density, electron density and effective atomic number of genipin were found to differ from water by less than 2%. For energies below 150 keV, photoelectric absorption cross sections are more than 3% higher than water due to the strong dependence on atomic number. Compton scattering and pair production interaction cross sections for genipin gel differ fromwater by less than 1%. The mass energy absorption coefficient is approximately 3%higher thanwater for energies<60 keVdue to the dominance of photoelectric absorption in this energy range. The electron mass stopping power and mass scattering power differ from water by approximately 0.3%. X-ray depth dose curves for genipin gel agree to within 1% with those for water. Our results demonstrate that genipin gel can be considered water equivalent for kilovoltage and megavoltage x-ray beam dosimetry. For megavoltage electron beam dosimetry, however, our results suggest that a correction factor may be needed to convert measured dose in genipin gel to that ofwater, since differences in some radiological properties of up to 3% compared to water are observed. Our results indicate that genipin gel exhibits greater water equivalency than polymer gels and PRESAGE formulations. © 2011 IOP Publishing LTD.en_AU
dc.identifier.citationGorjiara, T., Hill, R., Kuncic, Z., Bosi, S., Davies, J. B., & Baldock, C. (2011). Radiological characterization and water equivalency of genipin gel for x-ray and electron beam dosimetry. Physics in Medicine and Biology, 56 (15), 4685-4699. doi:10.1088/0031-9155/56/15/004en_AU
dc.identifier.govdoc5284en_AU
dc.identifier.issn0031-9155en_AU
dc.identifier.issue15en_AU
dc.identifier.journaltitlePhysics in Medicine and Biologyen_AU
dc.identifier.pagination4685-4699en_AU
dc.identifier.urihttp://dx.doi.org/10.1088/0031-9155/56/15/004en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5004en_AU
dc.identifier.volume56en_AU
dc.language.isoenen_AU
dc.publisherIOP Publishingen_AU
dc.subjectBeamsen_AU
dc.subjectPhantomsen_AU
dc.subjectPlasticsen_AU
dc.subjectWateren_AU
dc.subjectDosimetryen_AU
dc.subjectPowdersen_AU
dc.titleRadiological characterization and water equivalency of genipin gel for x-ray and electron beam dosimetryen_AU
dc.typeJournal Articleen_AU
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