Akademik

Cross-section
In anatomy, a cross-section is a transverse cut through a structure or tissue. The opposite of a cross-section is a longitudinal section. By analogy, a study may be cross-sectional or longitudinal.
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1. A transverse section through a structure. 2. The probability of an activation (5) by a nuclear reaction when a material is bombarded by neutrons, as in the production of radionuclides in a pile; unit : barn (10−24 cm2/atom).

Medical dictionary. 2011.