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 ?
226]Ra point sources shielded by a material with a low-atomic number, such as PMMA, is appropriate to design the simulated NORM sample.
in its definition of point sources both those pollution vehicles that
For instance, the EPA recently expressed a willingness to consider requiring all new and expanding point sources to generate net reductions in watershed loads (called "net improvement offsets") for permitted discharges to the Chesapeake Bay.
With its new strategy, the EPA will take a closer look at how much point sources contribute to exposure.
All of the point sources are together representing the total illumination of the sky.
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).
could not exempt some point sources, the number of applications would
The non-point to point source trade mechanism is critical to the success of reducing nutrient loading into Pennsylvania's waterways and ultimately the Chesapeake Bay because non-point sources contribute more than 50% of the delivered load of nutrients into the Bay.
With it, astronomers for the first time can distinguish between X-ray emissions from point sources, typically individual stars, and from the diffuse gas at our galaxy's center.
28) "[A]ny restriction established by a State or the Administrator [of the EPA] on quantities, rates, and concentrations of chemical, physical, biological, and other constituents which are discharged from point sources into navigable waters" is an effluent limitation.