Measurement of neutron dose component in central axis absorbed dose of 18 MV photon beam by TLD600 and TLD700 dosimeters
Background: In spite of clinically useful photon and electron beams, high energy linacs produce secondary particles such as neutrons (photo-neutron production). Neutrons have important roles during treatment with high energy photons in terms of protection and dose escalation. In this project, neutro...
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| Format: | Article |
| Language: | English |
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Tehran University of Medical Sciences
2012-09-01
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| Series: | Basic & Clinical Cancer Research |
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| Online Access: | https://bccr.tums.ac.ir/index.php/bccrj/article/view/34 |
| _version_ | 1818884910837923840 |
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| author | Hoda Darestani Hassan Ali Nedaie Azim Arbabi Kheirollah Mohammadi Mahmood Allahverdi Arjang Shahvar Negin Shahgholi |
| author_facet | Hoda Darestani Hassan Ali Nedaie Azim Arbabi Kheirollah Mohammadi Mahmood Allahverdi Arjang Shahvar Negin Shahgholi |
| author_sort | Hoda Darestani |
| collection | DOAJ |
| description | Background: In spite of clinically useful photon and electron beams, high energy linacs produce secondary particles such as neutrons (photo-neutron production). Neutrons have important roles during treatment with high energy photons in terms of protection and dose escalation. In this project, neutron dose equivalent of 18 MV Varian accelerators is calculated by TLD600 and TLD700.
Materials and Methods: For neutron and photon dose discrimination, first TLDs were calibrated versus definite gamma and neutron doses. Gamma calibration was done in two procedures; by standard 60Co source and by accelerator 18 MV photon beam. For neutron calibration by 241Am-Be source, irradiations were done in several different time intervals. Neutron dose equivalent was calculated in the central axis, on the phantom surface and depths of 1, 2, 3.3, 4, 5 and 6 cm.
Results: No photo-neutron dose was achieved on the phantom surface and depths of 1, 2, 3.3 cm. The maximum photo-neutron dose equivalent was 50 mSv*Gy-1 at the depth of 5 cm.
Conclusions: Photon absorbed dose calculation in central axis has an error of 5%. Neutron dose variation in different depths doesn’t show a regular procedure and in it seems to be due to the TLD inaccuracy for neutron dosimetry. |
| first_indexed | 2024-12-19T15:57:03Z |
| format | Article |
| id | doaj.art-aa74a994e0254251ba028f0b8745610c |
| institution | Directory Open Access Journal |
| issn | 2228-6527 2228-5466 |
| language | English |
| last_indexed | 2024-12-19T15:57:03Z |
| publishDate | 2012-09-01 |
| publisher | Tehran University of Medical Sciences |
| record_format | Article |
| series | Basic & Clinical Cancer Research |
| spelling | doaj.art-aa74a994e0254251ba028f0b8745610c2022-12-21T20:15:03ZengTehran University of Medical SciencesBasic & Clinical Cancer Research2228-65272228-54662012-09-0133&4Measurement of neutron dose component in central axis absorbed dose of 18 MV photon beam by TLD600 and TLD700 dosimetersHoda Darestani0Hassan Ali Nedaie1Azim Arbabi2Kheirollah Mohammadi3Mahmood Allahverdi4Arjang Shahvar5Negin Shahgholi61Nuclear Engineering Department, Science and Research unit, Azad University, Tehran, I.R. IranRadiotherapy Oncology Department, Cancer Institute, Tehran University of Medical Sciences, Tehran, I.R. IranRadiation Oncology Department, Imam Hussein Medical Center, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, I.R. IranNuclear Engineering Department, Amirkabir Industrial University, Tehran, I.R. IranRadiotherapy Oncology Department, Cancer Institute, Tehran University of Medical Sciences, Tehran, I.R. IranAgricultural, Medical and Industrial Research School, Karaj, I.R. IranNuclear Engineering Department, Science and Research unit, Azad University, Tehran, I.R. IranBackground: In spite of clinically useful photon and electron beams, high energy linacs produce secondary particles such as neutrons (photo-neutron production). Neutrons have important roles during treatment with high energy photons in terms of protection and dose escalation. In this project, neutron dose equivalent of 18 MV Varian accelerators is calculated by TLD600 and TLD700. Materials and Methods: For neutron and photon dose discrimination, first TLDs were calibrated versus definite gamma and neutron doses. Gamma calibration was done in two procedures; by standard 60Co source and by accelerator 18 MV photon beam. For neutron calibration by 241Am-Be source, irradiations were done in several different time intervals. Neutron dose equivalent was calculated in the central axis, on the phantom surface and depths of 1, 2, 3.3, 4, 5 and 6 cm. Results: No photo-neutron dose was achieved on the phantom surface and depths of 1, 2, 3.3 cm. The maximum photo-neutron dose equivalent was 50 mSv*Gy-1 at the depth of 5 cm. Conclusions: Photon absorbed dose calculation in central axis has an error of 5%. Neutron dose variation in different depths doesn’t show a regular procedure and in it seems to be due to the TLD inaccuracy for neutron dosimetry.https://bccr.tums.ac.ir/index.php/bccrj/article/view/34Neutron dosimetryCalibrationVarian acceleratorTLD600TLD700 |
| spellingShingle | Hoda Darestani Hassan Ali Nedaie Azim Arbabi Kheirollah Mohammadi Mahmood Allahverdi Arjang Shahvar Negin Shahgholi Measurement of neutron dose component in central axis absorbed dose of 18 MV photon beam by TLD600 and TLD700 dosimeters Basic & Clinical Cancer Research Neutron dosimetry Calibration Varian accelerator TLD600 TLD700 |
| title | Measurement of neutron dose component in central axis absorbed dose of 18 MV photon beam by TLD600 and TLD700 dosimeters |
| title_full | Measurement of neutron dose component in central axis absorbed dose of 18 MV photon beam by TLD600 and TLD700 dosimeters |
| title_fullStr | Measurement of neutron dose component in central axis absorbed dose of 18 MV photon beam by TLD600 and TLD700 dosimeters |
| title_full_unstemmed | Measurement of neutron dose component in central axis absorbed dose of 18 MV photon beam by TLD600 and TLD700 dosimeters |
| title_short | Measurement of neutron dose component in central axis absorbed dose of 18 MV photon beam by TLD600 and TLD700 dosimeters |
| title_sort | measurement of neutron dose component in central axis absorbed dose of 18 mv photon beam by tld600 and tld700 dosimeters |
| topic | Neutron dosimetry Calibration Varian accelerator TLD600 TLD700 |
| url | https://bccr.tums.ac.ir/index.php/bccrj/article/view/34 |
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