In particle-therapy, 2D dosimetry systems require high spatial resolution and linear dose response as the patient treatment show steep gradients of dose in depth. In this work we report on the characterization of the radiophotoluminescence (RPL) response from Al₂O₃:C,Mg films exposed to proton (61.3 MeV, 91.5 MeV, 155.5 MeV and 230 MeV) and carbon clinical beams (110 MeV/u). The film response is evaluated in terms of properties particularly important for relative dose measurements, as dose response, film uniformity and minimum detectable dose. The films, based on coatings with average grain sizes of ≈7 μm, demonstrate a better response than those used in our previous studies, with grain sizes of ≈47 μm. Moreover, the Linear Energy Transfer (LET) changes when penetrating through material and it is known that solid-state detectors change luminescence efficiency η_HT,γ as a function of LET. Therefore, we performed a detailed characterization of our new film to evaluate its response as function of dose and LET. The η_HT,γ curve, as a function of particle LET, obtained from discrete dose points (slabs) η_HT,γ is compared with the η_HT,γ curves from Al₂O₃:C (OSL) and Al₂O₃:C,Mg (RPL) films from our previous study. The η_HT,γ curves are consistent with Birks’ law, where we observe expected quenching for increasing LET. Additionally, we present 2D RPL images, using a wedge phantom, from Al₂O₃:C,Mg films irradiated with proton and carbon beams, which resulted in a 2D depth dose distribution of the Bragg curve and a comparable LET dependence with the data obtained with the slabs. The results confirm that the images obtained can be advantageously applied to obtain dose distribution in proton and carbon therapy without many corrections.

在粒子疗法中，二维剂量测定系统需要高空间分辨率和线性剂量响应，因为患者治疗显示出剂量深度的陡峭梯度。在这项工作中，我们报告了暴露于质子（61.3 MeV，91.5 MeV，155.5 MeV和230 MeV）和碳临床射线（110 MeV / u）的Al 2 O 3：C，Mg膜的放射光致发光（RPL）响应的特征。根据对相对剂量测量特别重要的特性，如剂量响应，薄膜均匀性和最小可检测剂量，评估薄膜响应。该薄膜基于平均晶粒度约为≈7μm的涂层，与我们先前的研究中使用的晶粒度约为≈47μm的薄膜相比，具有更好的响应性。此外，ηHT _，γ作为LET的函数。因此，我们对新膜进行了详细的表征，以评估其作为剂量和LET的函数的响应。的η _HT，γ曲线，作为粒子LET的函数，从离散剂量点获得（板坯）η _HT，γ与比较η _HT，γ C（OSL）和Al 2 O：C，镁（RPL从Al₂O₃曲线）我们先前研究的电影。该η _HT，γ曲线与伯克斯定律一致，在伯克斯定律中，我们观察到预期的淬灭会增加LET。此外，我们用楔形体模从质子和碳束辐照的Al 2 O 3：C，Mg薄膜中显示了二维RPL图像，这导致了Bragg曲线的2D深度剂量分布，并且具有与通过平板。结果证实，获得的图像可以有利地应用于获得质子和碳疗法中的剂量分布，而无需进行许多校正。