point source


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Related to point source: Nonpoint source

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 ?
Thus, the point source model will generate noticeable calculation errors in TL calculation due to the singularity.
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.
One is that water quality goals have been pursued through increasingly stringent and costly point source controls rather than through lower-cost nonpoint source controls.
After Jim came on board as a consultant, it quickly became clear that there was tremendous potential for a fit at a time when Point Source Audio is on a growth trajectory in the U.
According to the above-mentioned calibration method, the photopeak efficiency curves for the used 40% p-type HPGe gamma spectrometry system are shown in Figure 2 for the point source geometry, in Figure 3 for the Marinelli beaker geometry, and in Figure 4 for the cylindrical container geometry.
Derived from the equation giving temperature perturbation caused by a point source in an infinite homogeneous medium (Ingersoll et al.