Accuracy of gamma ray computerized tomography in porous media

1993 ◽  
Vol 29 (2) ◽  
pp. 479-486 ◽  
Author(s):  
Glenn O. Brown ◽  
Marvin L. Stone ◽  
Jack E. Gazin
Keyword(s):  
Porous Media ◽  
Computerized Tomography ◽  
Gamma Ray

QUANTIFICATION OF POROUS MEDIA USING COMPUTERIZED TOMOGRAPHY AND A STATISTICAL SEGREGATION THRESHOLD

1998 ◽  
Vol 41 (6) ◽  
pp. 1697-1706 ◽  
Author(s):  
H.-T. Hsieh ◽  
G. O. Brown ◽  
M. L. Stone
Keyword(s):  
Porous Media ◽  
Computerized Tomography

Analysis of the Compressibility of Sediments in Batch Settling Tests Using Newtonian and Non-Newtonian Fluids

2014 ◽  
Vol 802 ◽  
pp. 280-284 ◽  
Author(s):  
Bruno Arantes Moreira ◽  
Hélio de Oliveira ◽  
Fábio de Oliveira Arouca ◽  
João Jorge Ribeiro Damasceno
Keyword(s):  
Porous Media ◽  
Gamma Ray ◽  
Porous Matrix ◽  
Particulate Material ◽  
Oil Well ◽  
Local Concentration ◽  
Vertical Column ◽  
Well Drilling ◽  
Deformable Porous Media ◽  
Nondestructive Measurements

The study of compressibility in deformable porous media is of interest in many industrial processes, such as, filtration, thickening and during oil well drilling processes in the petrochemical sector. In this work the compressibility of porous media was evaluated by the comparison of solid concentration profiles in sediments using fluids with Newtonian and non-Newtonian behavior. For this, consolidation tests in distillated water, solutions of xanthan and glycerol were performed in a vertical column from the gravitational settling of suspensions. The porosity distribution in the formed sediment was obtained after the complete settling of particulate material. The local porosity measurements were performed using the ionizing radiation emitted by americium-241. The gamma-ray attenuation technique used in this study allowed the realization of nondestructive measurements for achieving local concentration of solids. The results showed that the rheological behavior of the fluid does not change significantly the compressibility of the porous matrix.

Measurement of porous media component content and heterogeneity using gamma ray tomography

1998 ◽  
Vol 34 (3) ◽  
pp. 365-372 ◽  
Author(s):  
H. T. Hsieh ◽  
Glenn O. Brown ◽  
Marvin L. Stone ◽  
Dan A. Lucero
Keyword(s):  
Porous Media ◽  
Gamma Ray ◽  
Media Component ◽  
Component Content

scholarly journals Geometric Sensitivity of a Pinhole Collimator

2010 ◽  
Vol 2010 ◽  
pp. 1-18 ◽  
Author(s):  
Howard Jacobowitz ◽  
Scott D. Metzler
Keyword(s):  
Computerized Tomography ◽  
Gamma Ray ◽  
Single Photon ◽  
Photon Emission ◽  
Elliptic Functions ◽  
Single Photon Emission ◽  
Double Integral ◽  
Detection Plane ◽  
Cauchy's Theorem ◽  
Pinhole Aperture

Geometric sensitivity for single photon emission computerized tomography (SPECT) is given by a double integral over the detection plane. It would be useful to be able to explicitly evaluate this quantity. This paper shows that the inner integral can be evaluated in the situation where there is no gamma ray penetration of the material surrounding the pinhole aperture. This is done by converting the integral to an integral in the complex plane and using Cauchy's theorem to replace it by one which can be evaluated in terms of elliptic functions.

scholarly journals Analysis of concrete material through gamma ray computerized tomography

2004 ◽  
Vol 34 (3a) ◽  
pp. 1020-1023 ◽  
Author(s):  
J. M. de Oliveira Jr. ◽  
A. C. G. Martins ◽  
J. A. DE Milito
Keyword(s):  
Computerized Tomography ◽  
Gamma Ray ◽  
Concrete Material
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