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 ?
232]Th) point sources shielded by different materials in order to simulate a bulk spectrum and keep isotopic ratios similar to some of the measured NORM samples that are commercially available (i.
With its new strategy, the EPA will take a closer look at how much point sources contribute to exposure.
For a point source with a center in direction [[omega].
Because the mussel facility is a point source under the statutory
Bion was able to generate these credits at Kreider Farms because of their unique ability to verify nutrient reductions, which traditionally has been a key impediment to the advancement of these types of non-point to point source trades.
Part II discusses the historical use of section 401 and why it has been applied solely to point source pollution.
The strategy embraces a suite of best management practices for nonpoint and point sources -- agriculture, wastewater treatment plants, urban stormwater and septic systems -- to meet Pennsylvania's nutrient and sediment reduction goals.
Health and environment information systems based on GIS may be useful in the risk assessment process (for exposure assessment, for disease mapping, for assessing health risks associated with point sources of pollution, and for estimating the numbers of people at risk).
To protect water quality, Federal regulations require any person who discharges or proposes to discharge from a point source, including a CAFO, to apply for an NPDES permit.