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Aug 13, 2022 at 17:04 comment added uhoh There's (at least) two different physical effects by which dust can interact with electromagnetic radiation; bulk absorption (attenuation) and dielectric scattering. The index of refraction of dust might be 1.1 or 1.5 in the UV (depending on density) but will deviate from 1.0 by only parts per million or less for X-rays, so scattering losses will probably be very low for X-rays. Depending on the wavelength and material type I assume that the bulk absorption lengths will be a lot longer (weaker) for X-rays as well. There are probably hard numbers out there...
Aug 13, 2022 at 16:41 history answered Justin T CC BY-SA 4.0