Is there any physical matter which won't appear on x-ray i.e. invisible matter? I think I learnt at university that all phsyical matter appears on x-ray and there is no matter that can be invisible. Is this true? For instance, does dark matter and antimatter appear on x-ray or what technology is used to prove that there is something instead of nothing?
Answer
There do not exist materials made of antimatter, so even though they would behave completely symmetrically to the corresponding matter materials, the fact is irrelevant.
Dark matter reacts only with gravity, and X-rays are electromagnetic waves. To all intents and purposes, as far as possibility of measurements, dark matter is transparent to X-rays, since the gravitational interaction of X-rays is miniscule.
What is your definition of transparency? For example flesh is transparent while bones and metal are not for an X-ray photograph.
Hard X-rays can penetrate some solids and liquids, and all uncompressed gases, and their most common use is to image the inside of objects in diagnostic radiography and crystallography.
There will always be some interaction of X-rays through matter, transparency has to be defined.
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