point source

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point source

(poynt sōrs),
In photometry, a small source of light that is regarded as a geometric point from which light emanates in straight lines in all directions.

point source

A geographically limited, fixed location from which a disease or an environmental pollutant spreads.

source, point 

A source whose dimensions are sufficiently small to cause a radiation with a high degree of coherence. If the point source is situated on the axis of an optical system it gives rise to an axial ray and it is referred to as an axial point source. See coherent sources; axial ray.
References in periodicals archive ?
1311(a), 1362(12) (prohibiting the "discharge of any pollutant" and defining discharge of a pollutant as the addition of a pollutant "to navigable waters from any point source").
Caption: Figure 5: The calibration energy curves (measured and fit) using standard point sources ([sup.60]Co and [sup.137]Cs) with NaI(Tl) well-type detector.
has proven effective in reducing pollution from point sources. (187)
The most important point sources are identified: B9, E501, B2, INT801, A3, B8, and G101.
This paper presents the full-energy peak efficiency calibration of a 40% p-type HPGe detector for point source, Marinelli beaker, and cylindrical container geometries.
Under a TMDL, "Waste Load Allocations" are assigned to point sources such as wastewater treatment plants, while "Load Allocations" are assigned to nonpoint sources such as agricultural runoff.
It should be pointed that if two or more point sources are concentrated in a sufficient small domain, the proposed method in the following section will treat them as one point source.
(55) After determining the discharges from the timber road ditches and culverts to be point sources, the court remanded the case and urged the EPA to enact a permitting program to regulate the channelized stormwater.