在里面nondestructive testing (NDT) field，工业射线照相可以说，可以说是最昂贵的方法之一。然而，关于安全性，由于暴露于电离辐射的风险，它独立。许多NDT方法共用由于环境危害，但射线照相是具有高剂量辐射问题的唯一主要方法。由于引入数字射线照相技术，这些担忧随着每一项创新而越来越小。

Modern equipment reduces the required overall radiation exposure to fractions of the original dose. This reduction in total dose allows the operation to take place in a much smaller square-footage than ever before, leaving more space for other trades to perform billable work. In fact, the right piece of equipment, though contracted at a higher hourly rate, could save a fabrication shop a considerable amount of money. Choosing the right modality could be the largest key to success.

数字成像选项的前两个竞争者是计算的射线照相（CR）和数字检测器阵列（DDA）。每个都有自己的特征，使它们在减少剂量下有效，但每个都有局限性可能是至关重要的。CR操作可以看到50％的辐射剂量减少，而DDA可能会看到同一检查的75％+减少。

数字探测器阵列安全优点和缺点

If parts for inspection are very small or relatively flat, DDA may be the answer to your problems. The detector array is, however, rigid, and relatively thick which makes it difficult to use in some applications. Through some engineering and modification, a DDA panel could be mounted in one specific location for manufactured parts to pass through the ‘imaging field.’ The panel allows for a direct-type imaging which requires no processing like CR or conventional film.

DDA面板还为射线照相安装提供了另一种奢侈品：目标墙。由于面板将刚性安装，因此面板后面的地板或墙壁可以在专用位置屏蔽。然后，辐射源可以与屏蔽或“准直”聚焦，只能进入适当大小的光束。这使占用区域的辐射水平保持在占用的高剂量的未占用区域。这也意味着屏蔽成本基本上下降。而不是四个混凝土墙，曝光区域可以通过一两个。大多数具有这种安装的制造商也可以将曝光区域降至需要哪个电影所需的一季度。

DDA does, however, need an installation and exposure plan to be truly effective at time reduction. That installation would likely need to be custom fabricated and the exposure plan made by an NDT professional. Those things cost time and money, but the savings could be huge. A long-seam pipe, that is, a pipe with a welded seam down its length, could take an hour to expose on film, then another half-hour of processing. Exposure with DDA could take minutes and requires no secondary processing. Total throughput could be 10 times shorter in this situation. There are endless custom configurations for DDA, so it’s relevant to many manufactured parts.

Computed Radiography Safety

If your inspection subjects aren’t easily adaptable to DDA, computed radiography may be more appropriate. Some inspection subjects have complex configurations, making them complicated to handle. In the case of process or spool piping, configurations tend to be varied in diameter as well as length. Valves and other castings tend to have varying thicknesses along with a small bore. CR will excel in conforming to these parts. The reduction of the radiation dose is not as drastic as DDA, but a reduction of half is nothing to scoff at.

That same reduction could be made to the dimensions of the exposure area, allowing additional trades to work safely in the saved square footage. For construction sites, space is always at a premium. A smaller barricaded area means other workers won’t be shut down, making more productive hours throughout the site.

CR also has a portability comparable to that of film, so it can completely replace film operations with no real issues. For the time being, film is still the lower cost option. However, that will change in the future as film gets more expensive, harder to find, and less requested.

无化学品工业射线照相法

CR和DDA份额都是无化学过程的一件事。传统的暗室配置以反应化学品加工银基薄膜为中心。通常采取护理以确保在一个地方没有丢失化学物质，而泄漏的机会低，它们永远不会为零。一些放射漆器不遵循必要步骤以防止溢出，因此它们可能会留下客户清洁。

数字模式不需要化学品进行处理。如果需要辅助处理，则通过应用能量和传感器来实现。例如，CR需要次要处理以完成成像。该处理是通过激光刺激成像板的激光和称为PMT的传感器而不是化学过程。DDA不需要速度加快曝光，并使校正顺利迅速且快速。

This absence of chemicals makes for a cleaner environment, but also eliminates a maintenance step. Chemicals deplete over time which demands replacement. A portable darkroom must travel to an appropriate location for chemical dumping and a stationary unit would need to be changed on-site. This represents, roughly, 300-plus pounds of liquid chemicals requiring containment and secondary containment to avoid spillage. The cost of correct handling can be relatively high, but the incorrect handling may cost thousands in fines.

更安全和经济高效的NDT操作

在电影中选择CR或DDA有很多原因。减少公众的辐射风险意味着工人，射线照相和非射线照相，从长远来看，较少的辐射。射线照相操作的少量占用空间使工人能够在较短的距离处安全。无化学加工也有助于任何网站上的危害暴露。这些事情终于导致了更安全，更具成本效益的操作。

Computed Radiography Webinar

Interested in learning more about the transition from traditional film to computed radiography? Click the link below to sign up for a webinar with the author, Wesley Soape.