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A few examples of absorption are ultraviolet—visible spectroscopy , infrared spectroscopy , and X-ray absorption spectroscopy. Finally, using the formula. Mathematical descriptions of opacity. This may be related to other properties of the object through the Beer—Lambert law. Namespaces Article Talk. Other measures of radiation absorption are penetration depth and skin effect , propagation constant , attenuation constant , phase constant , and complex wavenumber , complex refractive index and extinction coefficient , complex dielectric constant , electrical resistivity and conductivity.

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When using the mass attenuation coefficient, the Beer-Lambert law is written in alternative form as. Thus, the electromagnetic energy is transformed into internal energy of the absorber, for example thermal energy. Please help to improve this article by introducing more precise citations. November Learn how and when to remove this template message.

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The actual attenuation coefficient is computed by. In medicine , X-rays are absorbed to different extents by different tissues bone in particular , which is the basis for X-ray imaging. By using this site, you agree to the Terms of Use and Privacy Policy. Namespaces Article Talk.

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Description: The mass attenuation coefficient can be thought of as a variant of absorption cross section where the effective area is defined per unit mass instead of per particle. In chemistry and materials science , because different materials and molecules will absorb radiation to different extents at different frequencies, which allows for material identification. If there are N solutes or solvents, this procedure requires at least N measured wavelengths to create a solvable system of simultaneous equations , although using more wavelengths gives more reliable data. Tables of photon mass attenuation coefficients are essential in radiological physics, radiography for medical and security purposes , dosimetry , diffraction , interferometry , crystallography and other branches of physics. Photon Cross Sections Database". In biology , photosynthetic organisms require that light of the appropriate wavelengths be absorbed within the active area of chloroplasts , so that the light energy can be converted into chemical energy within sugars and other molecules. The mass attenuation coefficient is also called "mass extinction coefficient", which is the absorption coefficient divided by density. When using the mass attenuation coefficient, the Beer-Lambert law is written in alternative form as. The actual values have been thoroughly examined and are available to the general public through three databases run by National Institute of Standards and Technology NIST..
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