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Updated: Mar 1, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Technical Note: Angular dependence of a 2D monolithic silicon diode array for small field dosimetry.

Nauljun Stansook1,2, Kananan Utitsarn1, Marco Petasecca1,3

  • 1Centre for Medical Radiation Physics, University of Wollongong, NSW, 2500, Australia.

Medical Physics
|May 31, 2017
PubMed
Summary

This study developed an angular correction method for the MP512 silicon diode array, improving dose measurement accuracy in small fields. The corrected MP512 is suitable for 2D dose mapping of small photon beams.

Keywords:
monolithic 2D detectorquality assurancesilicon diodesmall field dosimetrystereotactic radiotherapy

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Silicon Diode Detectors

Background:

  • Accurate dose measurement is crucial in radiation therapy, especially for small fields.
  • Silicon diode arrays like the MP512 offer potential for 2D dose mapping.
  • Angular dependence of detectors can introduce significant measurement errors.

Purpose of the Study:

  • To investigate the angular response of the 52 × 52 mm2 monolithic silicon diode array (MP512).
  • To develop and validate an angular correction method for the MP512.
  • To assess the suitability of the corrected MP512 for small field dosimetry.

Main Methods:

  • The MP512 was irradiated with 6 MV and 10 MV photons at various incidence angles (0°–180°).
  • Angular correction factors were derived by comparing MP512 response with EBT3 film measurements.
  • Corrected MP512 profiles were compared against EBT3 film profiles for validation.

Main Results:

  • The MP512 showed intrinsic angular dependence, with maximum deviations of 18.5% (6 MV) and 15.5% (10 MV) at 0° incidence.
  • Angular response variation was less sensitive to field size than to photon energy.
  • Corrected MP512 profiles agreed within ±2% with EBT3 film for most angles, except at 90° incidence for small fields (up to 6% discrepancy).

Conclusions:

  • An angular correction factor is effective for the MP512 in small field dosimetry.
  • Potential discrepancies exist for measurements parallel to the detector plane with very small fields.
  • The MP512, with angular correction, is a viable tool for 2D dose mapping in small field photon beams.