ISO 13116:2014规定了通过参考铝标准样品测定试验材料无线电不透明度的试验方法。该方法旨在从临床意义上区分射血不透明度，而不是考虑可能影响射血不透明度精确固有值的因素，如背景噪声、X射线束功率、灰度校正和图像增强。人们认识到，这些因素可以改变射电不透明度的值，但不会改变与内部标准（如铝）的标准厚度相比的相对等级。该测试可使用牙科X射线仪器的常规或数字传感技术进行。

ISO 13116:2014 specifies test methods for determination of radio-opacity of a test material by reference to a specimen of an aluminium standard. The method is designed to discriminate radio-opacity at a clinically meaningful level and is not designed to take account of factors which may affect precise, inherent values of radio-opacity such as background noise, X-ray beam power, grey scale correction and image enhancement. It is recognized that such factors can change the value of radio-opacity but not the relative ranking compared to standard thicknesses of an internal standard such as aluminium. This test may be performed with conventional or digital sensoring techniques of dental X-ray apparatus.