Skip to content
6CCVD Research

Characteristics of microSilicon diode detector for electron beam dosimetry

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2021-09-08
JournalJournal of Radiation Research
AuthorsYuichi Akino, Indra J. Das, Masateru Fujiwara, Akari Kaneko, Takashi Masutani
InstitutionsOsaka Rosai Hospital, Northwestern Memorial Hospital
Citations5

Abstract

Section titled ā€œAbstractā€

Abstract A microSiliconā„¢ (PTW type 60023), a new unshielded diode detector succeeding Diode E (model 60017, PTW), was characterized for electron beam dosimetry and compared with other detectors. Electron beams generated from a TrueBeam linear accelerator were measured using the microSilicon, Diode E, and microDiamond synthetic single-crystal diamond detector. Positional accuracy of microSilicon was measured by data collected in air and water. The percent depth dose (PDD), off-center ratio (OCR), dose-response linearity, dose rate dependence, and cone factors were evaluated. The PDDs were compared with data measured using a PPC40 plane-parallel ionization chamber. The maximum variations of depth of 50% and 90% of the maximum dose, and practical depth among all detectors and energies were 0.9 mm. The maximum variations of the bremsstrahlung dose among all detectors and energies were within 0.3%. OCR showed good agreement within 1% for the flat and tail regions. The microSilicon detector showed a penumbra width similar to microDiamond, whereas Diode E showed the steepest penumbra shape. All detectors showed good dose-response linearity and stability against the dose rate; only Diode E demonstrated logarithmic dose rate dependency. The cone factor measured with microSilicon was within Ā±1% for all energies and cone sizes. We demonstrated that the characteristics of microSilicon is suitable for electron beam dosimetry. The microSilicon detector can be a good alternative for electron beam dosimetry in terms of providing an appropriate PDD curve without corrections, high spatial resolution for OCR measurements and cone factors.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2004 - Prescribing, recording, and reporting electron beam therapy (ICRU Report 71)
  2. 2009 - Recommendations for clinical electron beam dosimetry: supplement to the recommendations of Task Group 25 [Crossref]
  3. 2003 - The IPEM code of practice for electron dosimetry for radiotherapy beams of initial energy from 4 to 25 MeV based on an absorbed dose to water calibration [Crossref]
  4. 2006 - Intraoperative radiation therapy using mobile electron linear accelerators: report of AAPM Radiation Therapy Committee Task Group No. 72 [Crossref]
  5. 2019 - Breast intraoperative electron radiotherapy: Image-based setup verification and in-vivo dosimetry [Crossref]
  6. 1984 - Stopping powers for electrons and positrons (ICRU Report 37)
  7. 1985 - Characteristics of a p-Si detector in high energy electron fields [Crossref]
  8. 1987 - Practical methods of electron depth-dose measurement compared to use of the NACP design chamber in water [Crossref]
  9. 2001 - Determination of percentage depth-dose curves for electron beams using different types of detectors [Crossref]
  10. 2005 - Dosimetric characteristics of a new unshielded silicon diode and its application in clinical photon and electron beams [Crossref]

Reads Similar to This

An implantation Diamond detector as a beam monitor for an intense radioactive ion beam Adjoint-optimized nanoscale light extractor for nitrogen-vacancy centers in diamond Scattering of therapeutic radiation in the presence of craniofacial bone reconstruction materials