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 ?
Caption: Figure 4: The calibration energy curves (measured and fit) using standard point sources ([sup.60]Co and [sup.137]Cs) with NaI(Tl) well-type detector.
from any point source." (108) Likewise, a "pollutant" is
In this work PCA was employed to obtain useful information on point source pollution.
For the point source geometry, efficiency fitting adopted a linear equation of the logarithm of the efficiency against the logarithm of energy and also given in Figure 2a with fitting coefficients.
Now, Young-like experiments with first-order virtual point sources are analyzed.
First and foremost is that, unlike point source emissions, the movement of nutrients from farms to water resources cannot be metered.
The equation above gives the temperature variation at distance r after time t, due to a point source emitting instantaneously heat units Q at t--0.
The stainless steel and PMMA shielding in the MCNPX simulations were modeled as a sphere of the given radius centered at the point source. One hundred million particle histories were simulated to ensure that the relative Monte Carlo statistical uncertainties were in all cases smaller than 0.1 %.
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.
| DAMASCUS, Oct 4 (KUNA) -- Authorities are "seriously" conducting investigations to pin point source of gunfire across the border line on Wednesday that killed five Turkish civilians, Syrian Information Minister Omran Al-Zu'bi said.
Brown ("NEDC"), the Ninth Circuit ruled that stormwater runoff from two logging roads, once channeled through systems of culverts, ditches, and drains, was considered a point source discharge under the Clean Water Act.