nuclear cross section
cross section cross section n. 1. a flat plane cutting through a three-dimensional object, usually at right angles to the longest axis of the object. [PJC]

2. any visual representation of a {cross section[1]}, showing the internal structure of the object in the plane of the cross section; as, the technician prepared a series of MRI cross sections of the skull.

Note: Different cross sections created by different techniques may show different aspects of internal structure. Thus computerized axial tomography using X-rays shows different structures than are visualized by MRI. [PJC]

3. a thin slice of an object made by cutting it transversely; as, to view a cross section of a bacterium with an electron microscope after staining the DNA; cross sections were prepared with a microtome. [PJC]

4. a representative sample of a complex group; as, the town contained a cross section of the American population. [PJC]

5. (Physics) a measure of the probability that a nucleus will interact in a specified way with a bombarding particle, expressed as the effective area that the nucleus presents to the particle; -- called also {nuclear cross section}. [PJC]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Nuclear cross section — The nuclear cross section of a nucleus is used to characterize the probability that a nuclear reaction will occur. The concept of a nuclear cross section can be quantified physically in terms of characteristic area where a larger area means a… …   Wikipedia

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  • Cross section — may refer to: Cross section (geometry), the intersection of a 3 dimensional body with a plane Cross sectional views in architecture engineering Radar cross section, the unit of measure of how detectable an object is with a radar Cross section… …   Wikipedia

  • cross section — n. 1. a flat plane cutting through a three dimensional object, usually at right angles to the longest axis of the object. [PJC] 2. any visual representation of a {cross section[1]}, showing the internal structure of the object in the plane of the …   The Collaborative International Dictionary of English

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  • cross section — 1. a section made by a plane cutting anything transversely, esp. at right angles to the longest axis. 2. a piece so cut off. 3. a photograph, diagram, or other pictorial representation of such a section. 4. the act of cutting anything across. 5.… …   Universalium

  • cross section — n. 1. a) a cutting through something, esp. at a right angle b) a piece so cut off c) a drawing or photograph of a plane surface exposed by such a cutting 2. a sample that has enough of each kind in it to show what the whole is like 3. Nuclear… …   English World dictionary

  • 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. * * * 1. A transverse section through a… …   Medical dictionary

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