Journal
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
Volume 31, Issue 4, Pages 500-505Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppsc.201300276
Keywords
high-Z ceramic nanoparticles; radiosensitiser; dose enhancement; tantalum pentoxide
Funding
- Australian Institute of Nuclear Science and Engineering (AINSE) Research Fellowship
- small UOW Near Miss Grant
- UOW Faculty of Engineering Research Scholarship
- Australian Postgraduate Award Scholarship
- [DP 1093952]
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This article pioneers a study into the use of the tantalum pentoxide nanoceramics as novel candidates for dose enhancement radiotherapy. It is revealed that a significant induced dose enhancement on radioresistant cancer cells expose to tantalum pentoxide nanoparticles and irradiated with 10 MV. In this study, in vitro experiments are performed. The radiobiological endpoint is clonogenic survival. We exposed 9L gliosarcoma cells to the nanoparticles at 50-500 mu g mL(-1) range and observed concentration-dependent toxicity. Irradiation of the exposed and unexposed cells with 10 MV X-ray photons reveals a sensitization enhancement ratio of 1.33. The associated cell survival curves demonstrate a significant change in shape, indicative of increased lethality of the local radiation environment. We postulate that this enhancement is primarily due to secondary electrons produced from photoelectric interaction and pair production, with backscattering on nanoparticle aggregates leading to increased radiobiological effectiveness.
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