Light and Dark Spots
The light and dark spots come from when you expose a photographic plate to
x-rays. The plate starts off whitish, and when x-rays strike the plate, that
section of the plate gets darker.
That means that different amounts of x-rays are reaching different parts of
Uh-huh. And why should there be these differences? Try this out.
That makes sense and explains something else. Anytime there is more matter,
whether it's thicker or just has a higher density, fewer x-rays get out. Bones
appear lighter on the image because bone is denser than the rest of the body.
And in dental x-rays, metal fillings appear white, because the metal is very
dense. That's why they put a lead apron on you, to protect your body from the