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attenuation
subjectfact 
attenuationhas definition The falling off of the energy density of radiation with distance from the source, or with passage through an absorbing or scattering medium.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:29:45.0
is a kind of absorption2001-09-27 09:29:45.0
absorptionhas inverse process emission2001-09-27 09:29:45.0
radiation intensity modificationchanges property intensity2001-09-27 09:29:45.0
optical processhas domain optics2001-09-27 09:29:44.0