Response analysis of TLD-300 dosimeters in heavy-particle beams
| Autor: | T. Loncol, M Hamal, Jean-Marc Denis, Stefaan Vynckier, Pierre Scalliet, André Wambersie |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Quality Control
Materials science Physics::Medical Physics Linear energy transfer Bragg peak Sensitivity and Specificity Nuclear physics Optics Humans Radiology Nuclear Medicine and imaging Neutron Linear Energy Transfer Cobalt Radioisotopes Nuclear Experiment Neutrons Range (particle radiation) Dosimeter Radiological and Ultrasound Technology Radiotherapy business.industry Phantoms Imaging Water Radiotherapy Dosage Neutron radiation Cyclotrons Models Theoretical Carbon Luminescent Measurements Physics::Accelerator Physics Thermoluminescent dosimeter Protons business Beam (structure) |
| Zdroj: | Physics in medicine and biology. 41(9) |
| ISSN: | 0031-9155 |
| Popis: | In vivo dosimetry is recommended as part of the quality control procedure for treatment verification in radiation therapy. Using thermoluminescence, such controls are planned in the p(65) + Be neutron and 85 MeV proton beams produced at the cyclotron at Louvain-La-Neuve and dedicated to therapy applications. A preliminary study of the peak 3 (150 degrees C) and peak 5 (250 degrees C) response of CaF2:Tm (TLD-300) to neutron and proton beams aimed to analyse the effect of different radiation qualities on the dosimetric behaviour of the detector irradiated in phantom. To broaden the range of investigation, the study was extended to an experimental 12C heavy ion beam (95 MeV/nucleon). The peak 3 and 5 sensitivities in the neutron beam, compared to 60Co, varied little with depth. A major change of peak 5 sensitivity was observed for samples positioned under five leaves of the multi-leaf collimator. While peak 3 sensitivity was constant with depth in the unmodulated proton beam, peak 5 sensitivity increased by 15%. Near the Bragg peak, peak 3 showed the highest decrease of sensitivity. In the modulated proton beam, the sensitivity values were not significantly smaller than those measured in the unmodulated beam far from the Bragg peak region. The ratio of the heights of peak 3 and peak 5 decreased by 70% from the 60Co reference radiation to the 12C heavy-ion beam. This parameter was strongly correlated with the change of radiation quality. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|