Optical characterization of LiF:Mg,Cu,P – Towards 3D optically stimulated luminescence dosimetry

Jacob Søgaard Nyemann*, Rosana Martinez Turtos, Brian Julsgaard, Ludvig Muren, Peter Balling

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

The introduction of radiotherapy beam delivery with high spatial modulation, including spot-scanning proton therapy, calls for development of 3D dosimeters for patient-specific treatment verifications. Inherently reusable methods like optically stimulated luminescence (OSL) pose a potential way to introduce a clinically viable 3D-dosimetry solution. Here we present a characterization of the OSL properties of the well-known thermoluminescence material LiF:Mg,Cu,P (MCP). The characterization was performed by monitoring the wavelength-dispersed emission of continuous-wave stimulated MCP pellets. We show that OSL emission is observed under blue (460 nm) and green (532 nm) laser stimulation, while no OSL signal is seen in MCP under red (664 nm) laser stimulation. Long-wavelength fluorescence including accumulating radiophotoluminescence is very intense under blue stimulation and must be suppressed for continuous use of a future 3D-dosimetry system. An evaluation of the number of emitted photons is used to estimate a measurable dose range of 0.1–10 Gy, which prompts further research in the use of MCP for 3D OSL-based dosimetry.

Original languageEnglish
Article number106390
JournalRadiation Measurements
Volume138
Number of pages6
ISSN1350-4487
DOIs
Publication statusPublished - Aug 2020

Keywords

  • Dosimetry
  • LiF:Mg,Cu,P
  • Lithium fluoride
  • Luminescence
  • MCP
  • OSL

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