Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry
The response of the commercial XRA-24 PIN photodiode (5.76 mm2 active area) for clinical electron beam dosimetry covering the range of 8-12 MeV was investigated. Within this energy range, the charge generated in the diode’s sensitive volume is linearly dependent on the absorbed dose up to 320 cGy. ...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)
2019-02-01
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| Series: | Brazilian Journal of Radiation Sciences |
| Subjects: | |
| Online Access: | https://bjrs.org.br/revista/index.php/REVISTA/article/view/577 |
| _version_ | 1798027419085438976 |
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| author | Cristina R. Nascimento Viviane K. Asfora Vinicius R. M. Barros Josemary A. C. Gonçalves Luiza F. R. Andrade Helen J. Khoury Carmen C. Bueno |
| author_facet | Cristina R. Nascimento Viviane K. Asfora Vinicius R. M. Barros Josemary A. C. Gonçalves Luiza F. R. Andrade Helen J. Khoury Carmen C. Bueno |
| author_sort | Cristina R. Nascimento |
| collection | DOAJ |
| description |
The response of the commercial XRA-24 PIN photodiode (5.76 mm2 active area) for clinical electron beam dosimetry covering the range of 8-12 MeV was investigated. Within this energy range, the charge generated in the diode’s sensitive volume is linearly dependent on the absorbed dose up to 320 cGy. However, charge sensitivity coefficients evidenced that the dose response of the diode is slightly dependent on the electron beam energy. Indeed, the diode’s energy dependence was within 8.5% for 8-12MeV electron beams. On the other hand, it was also observed an excellent repeatability of these results with a variation coefficient (VC) lower than 0.4%, which is within the 1% tolerance limit recommended by the AAPM TG-62. Furthermore, the agreement between the percentage depth dose profiles (PDD) gathered with the diode and the ionization chamber allowed achieving the electron beam quality within 1% of that obtained with the ionization chamber. Based on these results, the photodiode XRA-24 can be a reliable and inexpensive alternative for electron beams dosimetry.
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| first_indexed | 2024-04-11T18:51:07Z |
| format | Article |
| id | doaj.art-d12548988cbd44729def9678be70594b |
| institution | Directory Open Access Journal |
| issn | 2319-0612 |
| language | English |
| last_indexed | 2024-04-11T18:51:07Z |
| publishDate | 2019-02-01 |
| publisher | Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR) |
| record_format | Article |
| series | Brazilian Journal of Radiation Sciences |
| spelling | doaj.art-d12548988cbd44729def9678be70594b2022-12-22T04:08:21ZengBrazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)Brazilian Journal of Radiation Sciences2319-06122019-02-0172A10.15392/bjrs.v7i2A.577Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetryCristina R. Nascimento0Viviane K. Asfora1Vinicius R. M. Barros2Josemary A. C. Gonçalves3Luiza F. R. Andrade4Helen J. Khoury5Carmen C. Bueno6Universidade Federal de Pernambuco - UFPE; Instituto Federal de Educação, Ciência e Tecnologia de Pernambuco – IFPEUniversidade Federal de Pernambuco - UFPEUniversidade Federal de Pernambuco - UFPEInstituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SPSanta Casa de Misericórdia de ItabunaUniversidade Federal de Pernambuco - UFPEInstituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP The response of the commercial XRA-24 PIN photodiode (5.76 mm2 active area) for clinical electron beam dosimetry covering the range of 8-12 MeV was investigated. Within this energy range, the charge generated in the diode’s sensitive volume is linearly dependent on the absorbed dose up to 320 cGy. However, charge sensitivity coefficients evidenced that the dose response of the diode is slightly dependent on the electron beam energy. Indeed, the diode’s energy dependence was within 8.5% for 8-12MeV electron beams. On the other hand, it was also observed an excellent repeatability of these results with a variation coefficient (VC) lower than 0.4%, which is within the 1% tolerance limit recommended by the AAPM TG-62. Furthermore, the agreement between the percentage depth dose profiles (PDD) gathered with the diode and the ionization chamber allowed achieving the electron beam quality within 1% of that obtained with the ionization chamber. Based on these results, the photodiode XRA-24 can be a reliable and inexpensive alternative for electron beams dosimetry. https://bjrs.org.br/revista/index.php/REVISTA/article/view/577Electron dosimetrySi photodiodes dosimetersSolid-state dosimetry |
| spellingShingle | Cristina R. Nascimento Viviane K. Asfora Vinicius R. M. Barros Josemary A. C. Gonçalves Luiza F. R. Andrade Helen J. Khoury Carmen C. Bueno Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry Brazilian Journal of Radiation Sciences Electron dosimetry Si photodiodes dosimeters Solid-state dosimetry |
| title | Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry |
| title_full | Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry |
| title_fullStr | Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry |
| title_full_unstemmed | Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry |
| title_short | Feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry |
| title_sort | feasibility studies of using thin entrance window photodiodes for clinical electron beam dosimetry |
| topic | Electron dosimetry Si photodiodes dosimeters Solid-state dosimetry |
| url | https://bjrs.org.br/revista/index.php/REVISTA/article/view/577 |
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