Comparative investigations of the relative thermoluminescent efficiency of LiF detectors to protons at different proton therapy facilities

Characterization of passive dosimeters in proton pencil beam scanning – A EURADOS intercomparison for mailed dosimetry audits in proton therapy centres

“…Nevertheless the response of MCP-N measured in our study was slightly lower (5-8%) compared to the published data [33]. For example, for the same LET f of 1.5 keV/µm the relative response was 0.76 in our study compared to 0.81 in the study from Sądel et al [33]. This can be due to the anomalous low temperature anomalous behavior of LiF: Mg,Cu,P detectors when exposed to light particles if a post-irradiation pre-readout protocol is not applied, or because response corrections for the material composing the detectors are not performed [39].…”

“…An even larger under response of measured dose compared to TPS is observed for MCP-N, which ranged from 17% for R20M20 to 27% for R5M5. These MCP-N data confirm that the response is inversely proportional to the LET of the protons, as shown also by Sądel et al [33], and demonstrated in the next section through the dosimeter response as function of LET f . The MTS-N measured a higher dose than TPS for SOBP…”

“…The most pronounced under response was seen for MCP-N (up to 27%) for which response largely depends on the particle LET as published in previous data from Sądel et al [33]. Nevertheless the response of MCP-N measured in our study was slightly lower (5-8%) compared to the published data [33]. For example, for the same LET f of 1.5 keV/µm the relative response was 0.76 in our study compared to 0.81 in the study from Sądel et al [33].…”

“…4, demonstrating a similar change of the TL response as function of LET f . Nevertheless this work shows MCP-N TL response data that were on average 6% lower than the published data [33]. On the other hand, the MTS-N showed very good agreement within 2%.…”

“…Our data demonstrate an underestimation of TPS dose for the GD-352M, MCP-N and Al 2 O 3 :C detectors, due to a decreased detector response in PT compared to Co-60. The most pronounced under response was seen for MCP-N (up to 27%) for which response largely depends on the particle LET as published in previous data from Sądel et al [33]. Nevertheless the response of MCP-N measured in our study was slightly lower (5-8%) compared to the published data [33].…”