A μm thin dosimetric coating material based on inorganic phosphor particles NaYF:Yb, Er has been developed. A dose dependency of the luminescence decay time is observed in the μs - ms domain which allows relative dose measurement in the kGy range. Dose values are obtained from decay time evaluation which facilitates a measurement independent of luminescence emission intensity. Here, near-IR luminescence after excitation with 5 ms pulses of near-infrared light is analyzed. The dosimetric material can be directly sprayed onto the surface of objects and therefore renders particularly useful for dose distribution measurements on non-planar geometries. Because of the μm thickness and the direct contact of the dosimetric material to the entire surface of an object, the results can be considered as ‘true’ surface doses. Three dimensional dose maps were derived by scanning the entire surfaces of irradiated objects. Proof-of-concept is provided by good agreement in dose results as well as dose pattern with film dosimetry (Risø B3 strips) and the approach therefore qualifies especially for use in 3D dose mapping of complex geometries. This novel approach provides unprecedented insights into dose distributions of irradiated objects of complex geometries, as exemplified by dose results for outer and inner surfaces of e-beam irradiated bottles for two different irradiation set-ups.

中文翻译：

---

使用微米薄剂量测定层进行 3D 相对剂量测量


开发了一种基于无机磷颗粒NaYF:Yb、Er的μm薄剂量涂层材料。在 μs - ms 域中观察到发光衰减时间的剂量依赖性，这允许在 kGy 范围内进行相对剂量测量。剂量值是从衰减时间评估中获得的，这有助于独立于发光发射强度的测量。此处，分析了 5 ms 近红外光脉冲激发后的近红外发光。剂量测定材料可以直接喷涂到物体表面，因此对于非平面几何形状的剂量分布测量特别有用。由于微米厚度以及剂量测定材料与物体整个表面的直接接触，结果可以被视为“真实”表面剂量。通过扫描受辐射物体的整个表面得出三维剂量图。剂量结果以及剂量模式与胶片剂量测定（Risø B3 条带）的良好一致性提供了概念验证，因此该方法特别适用于复杂几何形状的 3D 剂量测绘。这种新颖的方法为复杂几何形状的辐照物体的剂量分布提供了前所未有的见解，两种不同辐照设置的电子束辐照瓶子的外表面和内表面的剂量结果就是例证。