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Comperism between geometric unsharpnes and radiographic unsharpness?
Wiki User
∙ 13y ago
geometric unsharpness is fixed by setting the focal radius,etc.
while radiographic unsharpness consists of both geometric and film unsharpness.
Wiki User
∙ 13y ago
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Can a form be geometric?
That all depends on what you mean by "form". If you are referring to "shape", then yes it can be geometric. For instance, a triangle is geometric.
What is the geometric means in geometry?
"Geometric" means of, or referring to, geometry.
What are geometric drawings?
Geometric refers to shapes .. the geometric draws are usually mathematical in nature heavy on lines and technical shapes
What countries look like geometric shapes?
Every country looks like an irregular geometric shape.Every country looks like an irregular geometric shape.Every country looks like an irregular geometric shape.Every country looks like an irregular geometric shape.
A term for a geometric figure that encloses another geometric figure?
circumscribed
What are the three principal geometric factors may affect radiographic quality?
image magnification,image distortion,image un sharpness
How do you calculate radiographic Diagnostic film length?
do you know about Penumbra calculation as its calculated from this? Ug=FxT/D Ug=Geometric Unsharpness F= Source or Window Size T= Object Thickness D= Distance from source to the front surface of the Test Object. Your Diagnostic film length is calculated from this. Depending on what standards you work to they will tell you how many shots to do on what thickness of material as well as distance shot from. there is a chart that can be referenced but i can't remember what its called. i will try & find out but i hope this helps
What is the relationship of focal spot blur and geometric unsharpness?
The finite size of the focal spot results in divergence of the beam beyond the magnified image of the object (creating an area called the penumbra). This is termed focal spot or geometric blurring and results in reduced image resolution. In the absence of magnification (that is, the image is adjacent to the receptor) there is no focal spot blurring.
What causes radiographic unsharpness?
Radiographic unsharpness, or geometric unsharpness (Ug) as it is widely known in the NDT (Non-destructive Testing) industry, can be measured and controlled. Ug is related to the geometry of the radiographic technique and simply put, is the amount of 'blur' present in a radiological image. The primary factors contributing to Ug in the radiographic technique are: 1. A excessively large focal spot (point from which the usable radiation beam emanates). In X-ray tubes, this is the area where high speed electrons are focused onto the target, resulting in the generation of photons. In gamma-ray sources, focus is the actual physical size of the radioactive material. Typical focus for an industrial X-ray tube (10 mA) may range from 4 to 7 mm. Gamma-ray source size is often about 1/8". 2. Excessive test specimen (object) to detector distance, as related to focal spot size (FSS). There are mini- and micro-focus X-ray systems available that can be used to magnify the image of the test specimen (up to 100x or more), while limiting Ug. Some of these micro-focus X-ray systems may have a focus of less than 10 microns. Gamma-ray sources are manufactured to have as high of a specific activity (radiation output per unit of mass) as possible, thus limiting physical size of the source material and resultant exposure time. Ug can be minimized by using as small a focal spot as possible or available, keeping the test specimen in contact with or as close to the detector as possible, or using a longer source to film distance (which will increase exposure time). These factors can be adjusted to suit the inspection application, or to achieve compliance with a specification. Also, any motion of the test specimen, detector or source that may occur during exposure will cause unsharpness, but this situation is not related to geometry. Industrial radiography specifications limit acceptable Ug from .04" down to .002", depending upon material thickness and service application (aerospace component vs. automotive part) of the test specimen. Ug for any radiographic technique can be easily calculated using the following formula: Ug=FSS x ODD/SOD FSS=Focal spot size ODD=Object to detector distance(source side of object to detector distance) SOD=Source to object distance
Is Fibonacci arithmetic or geometric?
Geometric
What are some examples of geometric?
There aren't any. Geometric is an adjective and you need a noun to go with it before it is possible to consider answering the question. There are geometric sequences, geometric means, geometric theories, geometric shapes. I cannot guess what your question is about.
What is the geometric number of 5 and 320?
If, by geometric number (?) you mean geometric mean, then the answer is 40.
What do you call a geometric painting?
A geometric painting
What is a non-geometric?
Algebraic is non-geometric.
What is a geometric echo?
Geometric echo is a repeating shape in a pattern. The stars on the US flag is a geometric echo.
Is the sum of two geometric sequence a geometric sequence?
No.
What is the geometric name of a rhombus?
Rhombus is the geometric name.
