Monte Carlo-based dosimetric studies of a locally developed 170Tm LDR brachytherapy seed source
| Autor: | Sridhar Sahoo, Yogendra Kumar, Sonika Saxena, Usha Pandey, Manoj Kumar, Munir S Pathan, T. Palani Selvam |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Photon medicine.medical_treatment Brachytherapy Monte Carlo method Public Health Environmental and Occupational Health Bremsstrahlung General Medicine Photon energy Spectral line 030218 nuclear medicine & medical imaging Computational physics 03 medical and health sciences 0302 clinical medicine 030220 oncology & carcinogenesis Beta (plasma physics) Beta particle medicine Waste Management and Disposal |
| Zdroj: | Journal of Radiological Protection. 41:197-215 |
| ISSN: | 1361-6498 0952-4746 |
| Popis: | 170Tm is being explored as a source for applications in brachytherapy. Although it has adequate physical properties, such as a short half-life (128.6 d), high specific activity and a mean photon energy of about 66 keV, it has a drawback of low photon yield (only about six photon emissions/100 beta emissions). The objective of this work is to study the dosimetric characteristics of a locally developed 170Tm brachytherapy seed source using the Monte Carlo-based EGSnrc code system. In this study, we calculate the dose rate constant, air-kerma strength, radial dose function, anisotropic function and 2D dose-rate distributions in water. Separate simulations are carried out by considering the photon (gamma and characteristic x-ray) and beta spectra of the source. For regions close to the source (surface of the source < r < 0.4 cm), the dose is solely due to direct dose deposition by beta particles. At larger distances (0.4 cm < r −1U−1. The value of S k per mCi is 0.029 ± 0.0009 U mCi−1. The contributions of the inherent photon emission and the bremsstrahlung photons to the total S k are 0.58 and 0.42, respectively. |
| Databáze: | OpenAIRE |
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