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absorption (ab-sorp´shәn) the act of taking up or in by specific chemical or molecular action, such as in chemical absorption or digestive absorption. in psychology, devotion of thought to one object or activity only. radiation absorption. in chemistry, the penetration of a substance within the inner structure of another; see also adsorption. chemical absorption
absorption (def. 4). digestive absorption
the passage of the end products of digestion from the gastrointestinal tract into the blood and lymphatic vessels and the cells of tissues; this can take place by either
diffusion or active transport. radiation absorption
in radiology, the uptake of energy by matter with which the radiation interacts. It can vary with the mass (density) subjected
to x-radiation and the penetrability of the x-rays; this phenomenon is of particular importance in diagnostic and therapeutic
radiology, which depends on the interaction between ionizing radiations and matter. As radiation passes through matter, it
is absorbed by an amount dependent on the atomic and molecular structure and thickness of the substance, and the energy of
the primary photons.
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