X-Rays can penetrate matter. It is weakened differently depending on the type of material. The attenuation of X-rays is the most important factor in radiographic imaging.
The radiation intensity of the X-ray beam decreases exponentially with I = I_0e^-µx of the path length x traveled in the specific material.
Related topics:
X-Rays
Detector
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.