A thin layer fiber-coupled luminescence dosimeter based on Al2O3:C

作者：Klein F A; Greilich S^*; Andersen C E; Lindvold L R; Jaekel O

来源：Radiation Measurements, 2011, 46(12): 1607-1609.

DOI：10.1016/j.radmeas.2011.05.030

• Luminescence dosimetry
• Fiber-coupled
• Radioluminesence
• Proton therapy
• Ion beam therapy
• High spatial resolution

In this paper we present a fiber-coupled luminescent Al2O3:C dosimeter probe with high spatial resolution (0.1 mm). It is based on thin layers of Al2O3:C crystal powder and a UV-cured acrylate monomer composition. The fabrication of the thin layers is described in detail. No influence of the introduced polymer host matrix on the dosimetric properties was observed. Depth-dose measurements with the new detectors in a 142.66 MeV proton and 270.55 MeV/u carbon ion beam are presented as example applications. We used an RL protocol with saturated crystals allowing for time-effective measurements without sensitivity corrections. For protons, a relative luminescence efficiency limy of 0.715 +/- 0.014 was found in the Bragg peak. For carbon ions, a value of 0.498 +/- 0.001 was found in the entrance channel, 0.205 +/- 0.015 in the Bragg peak, and a mean of 0.413 +/- 0.050 in the tail region. The mean range of the protons measured with this new detector deviated by less than 1% from the reference value. For both ion types, the stem effect contributed less than 0.8% of the RL signal.