point source


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Related to point source: Nonpoint source

point source

A celestial object whose angular extent is too small to be measured.

point source

[′pȯint ‚sȯrs]
(civil engineering)
A municipal or industrial wastewater discharge through a discrete pipe or channel.
(physics)
A source of radiation having definite position but no extension in space; this is an ideal which is a good approximation for distances from the source sufficiently large compared to the dimensions of the source.

point source

A light source whose dimensions are insignificant compared with the distance at which it is used; e.g., a fluorescent lamp is a point source when viewed from a large distance but a line source when viewed close to the source.
References in periodicals archive ?
And because the court determined that the landfill and settling ponds constituted "point sources" as defined by the Act, it found Dominion liable under the Act.
Badawi et al., "New numerical simulation metho d to calibrate the regular hexagonal NaI(Tl) detector with radioactive point sources situated non-axial," Review of Scientific Instruments, vol.
5: Propagation maps of point source across the changed slab for TE mode point source (a) the modified first row (b) the modified second row (c) the modified third row (d) the modified fourth row (e) the modified fifth row (f) the modified sixth row (7) the modified seventh row modified row is optimal when the position of the modified row is at the bottom layer.
pollutant from a point source," the Act also defines all of the
Once point source pollution by heavy metals and PAH was assessed, a final step was carried out in order to identify possible environmental risk.
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.
The first type is called radiant point sources and they are located at first layer.
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.
The point source solution is given by Ingersoll et al.
Each radionuclide source was modeled as a point source in air emitting photons with the appropriate energies and relative emission probabilities.
Consequently, we assume that the locations of the point sources [[theta].sub.j] are not known but an initial guess location [[bar.[theta]].sub.j] is given for each unknown point source.