Cowan Joseph S, Flippo Kirk A, Gaillard Sandrine A
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Rev Sci Instrum. 2008 Oct;79(10):10E535. doi: 10.1063/1.2971974.
Radiochromic film (RCF) is increasingly being used as a detector for proton beams from short-pulse laser-matter interaction experiments using the RCF imaging spectroscope technique. The community has traditionally used inexpensive flatbed scanners to digitize and analyze the data, as opposed to more expensive and time-consuming microdensitometers (MicroDs). Often, the RCF densities in some regions exceed an optical density (OD) of 3. Flatbed scanners are generally limited to a maximum OD of approximately 3. Because of the high exposure density, flatbed scanners may yield data that are not reliable due to light scatter and light diffusion from areas of low density to areas of high density. This happens even when the OD is slightly above 1. We will demonstrate the limitations of using flatbed scanners for this type of radiographic media and characterize them compared to measurements made using a MicroD. A technique for cross characterizing both systems using a diffuse densitometer with a NIST wedge will also be presented.
放射变色薄膜（RCF）越来越多地被用作使用RCF成像光谱技术的短脉冲激光与物质相互作用实验中质子束的探测器。传统上，该领域一直使用廉价的平板扫描仪对数据进行数字化和分析，而不是使用更昂贵且耗时的微密度计（MicroDs）。通常，某些区域的RCF密度超过3的光密度（OD）。平板扫描仪通常限于最大OD约为3。由于高曝光密度，平板扫描仪可能会由于光散射以及光从低密度区域扩散到高密度区域而产生不可靠的数据。即使OD略高于1时也会发生这种情况。我们将展示使用平板扫描仪处理此类射线照相介质的局限性，并将其与使用MicroD进行的测量结果进行比较。还将介绍一种使用带有美国国家标准与技术研究院楔形板的漫射密度计对这两种系统进行交叉表征的技术。
