DEVELOPMENT AND IMPLEMENTATION OF A PORTABLE NUCLEONIC COMPUTED TOMOGRAPHY SYSTEM WITH CLAMP-ON-FEATURES FOR ENGINEERING INSPECTION

2015 ◽  
Vol 77 (17) ◽  
Author(s):  
Jaafar Abdullah ◽  
Hearie Hassan ◽  
Mohamad Rabaie Shari ◽  
Maslina Mohd Ibrahim ◽  
Nolida Yussup ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Gamma Ray ◽  
Bubble Column ◽  
Great Promise ◽  
Hydrodynamic Behavior ◽  
Tomographic Images ◽  
Tomography System ◽  
Set Up ◽  
System Configurations

The development and implementation of a portable nucleonic computed tomography system with clamp-on-features, called “GammaSpider”, employing gamma-ray for engineering inspection is briefly discussed. Depending on the object to be inspected, a small isotopic gamma-ray source, in combination of a NaI(Tl) scintillation detector and an autonomous mechanical gantry set-up are used. The basic theoretical aspects, the system configurations and the other features are presented. This system is capable of generating high quality tomographic images and thus, offers great promise for in-situ engineering inspection. It is successfully used to inspect blockages in pipelines, to examine wooden electric poles and to study hydrodynamic behavior of multiphase flow in a bubble column.  Some of the preliminary results are presented in this paper.

scholarly journals Computed Tomography to Estimate the Representative Elementary Area for Soil Porosity Measurements

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Jaqueline Aparecida Ribaski Borges ◽  
Luiz Fernando Pires ◽  
André Belmont Pereira
Keyword(s):  
Computed Tomography ◽  
Gamma Ray ◽  
Strong Relationship ◽  
Soil Porosity ◽  
Soil Physics ◽  
Tomographic Images ◽  
Section Area ◽  
Ideal Tool ◽  
Porosity Measurements ◽  
Elementary Area

Computed tomography (CT) is a technique that provides images of different solid and porous materials. CT could be an ideal tool to study representative sizes of soil samples because of the noninvasive characteristic of this technique. The scrutiny of such representative elementary sizes (RESs) has been the target of attention of many researchers related to soil physics field owing to the strong relationship between physical properties and size of the soil sample. In the current work, data from gamma-ray CT were used to assess RES in measurements of soil porosity (ϕ). For statistical analysis, a study on the full width at a half maximum (FWHM) of the adjustment of distribution ofϕat different areas (1.2 to 1162.8 mm2) selected inside of tomographic images was proposed herein. The results obtained point out that samples with a section area corresponding to at least 882.1 mm2were the ones that provided representative values ofϕfor the studied Brazilian tropical soil.

Compact high-resolution gamma-ray computed tomography system for multiphase flow studies

2013 ◽  
Vol 84 (3) ◽  
pp. 033106 ◽  
Author(s):  
A. Bieberle ◽  
H. Nehring ◽  
R. Berger ◽  
M. Arlit ◽  
H.-U. Härting ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Multiphase Flow ◽  
Gamma Ray ◽  
Tomography System ◽  
Gamma Ray Computed Tomography ◽  
High Resolution Gamma

Tomographic images by proton Computed Tomography system for proton therapy applications

2011 ◽  
Author(s):  
Valeria Sipala ◽  
Mara Bruzzi ◽  
Mirko Brianzi ◽  
Marta Bucciolini ◽  
Giuseppe Antonio Pablo Cirrone ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Proton Therapy ◽  
Tomographic Images ◽  
Tomography System ◽  
Proton Computed Tomography

Gas–liquid distribution in a bubble column using industrial gamma-ray computed tomography

2014 ◽  
Vol 95 ◽  
pp. 396-400 ◽  
Author(s):  
Carlos Henrique de Mesquita ◽  
Diego Vergaças de Sousa Carvalho ◽  
Rodrigo Kirita ◽  
Pablo Antonio S. Vasquez ◽  
Margarida Mizue Hamada
Keyword(s):  
Computed Tomography ◽  
Gamma Ray ◽  
Bubble Column ◽  
Liquid Distribution ◽  
Gamma Ray Computed Tomography

Development of a Gamma-Ray Process Tomography System for Hydrodynamic Characterisation of Multiphase Reactors

2011 ◽  
Vol 83 ◽  
pp. 41-47 ◽  
Author(s):  
Abdullah Jaafar ◽  
Mohd Khairi Mohd Said ◽  
Nur Aira Abdul Rahman ◽  
Salzali Mohd ◽  
Mohamad Rabaie Shari ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Reconstruction ◽  
Gamma Ray ◽  
Imaging Technique ◽  
Ct Scanner ◽  
Multiphase Reactors ◽  
Non Invasive ◽  
Tomography System ◽  
Expectation Maximisation ◽  
Gamma Ray Computed Tomography

Gamma-ray computed tomography (CT) is a powerful non-invasive imaging technique for viewing an object in 2-D or 3-D cross-section images without the need to physically section it. The invention of CT technique revolutionised the field of medical diagnostic imaging because it provides more detailed and useful information than any previous non-invasive imaging technique. The method is increasingly used in industrial fields. This paper describes the development of a gamma-ray computed tomography system for imaging and visualising of industrial multiphase reactors. The theoretical aspects of CT scanner, the system configurations and the adopted algorithm for image reconstruction are discussed. Penetrating radiation from an isotopic gamma-ray source of Cs-137 and a bank of NaI(Tl) scintillation detectors in combination with a dedicated mechanical gantry set-up were used to construct the CT system. During scanning, the movement of the detector’s bank and rotation table is controlled by a LabView-based software. The software is also designed to control all associated nuclear electronics equipments and finally to acquire gamma-ray transmission data. The image reconstruction is performed by using Expectation-Maximisation (EM) and Alternating-Maximisation (AM) algorithms written in Visual-Fortran programming language. Several physical phantoms to simulate industrial multiphase process columns and reactors were scanned using this CT scanner. Some of the reconstructed images are presented in this paper.

Simulation of a Gamma-Ray Computed Tomography System Using Two Radioisotopes for Structural Inspections: A Preliminary Study

2017 ◽  
Vol 64 (10) ◽  
pp. 2673-2677
Author(s):  
Dong-Hoon Lee ◽  
Chanwoo Park ◽  
Cheol-Ha Baek ◽  
Chaeyeong Lee ◽  
Seung-Jae Lee ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Gamma Ray ◽  
Tomography System ◽  
Preliminary Study ◽  
Gamma Ray Computed Tomography

scholarly journals In situ gamma-ray measurements of marine sediment using Monte Carlo simulation

2012 ◽  
Vol 20 ◽  
pp. 139
Author(s):  
E. Androulakaki ◽  
C. Tsabaris ◽  
D. L. Patiris ◽  
G. Eleftheriou ◽  
M. Kokkoris ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Marine Sediments ◽  
Gamma Ray ◽  
Close Contact ◽  
Gamma Ray Spectrometer ◽  
Activity Measurements ◽  
Mcnp5 Code ◽  
Set Up ◽  
Experimental Geometry

This work outlines the progress in developing a new method for in situ radioactivity measurements of marine sediments. The method combines the underwater gamma-ray spectrometer (a system named KATERINA based on a NaI(Tl) detector) with Monte-Carlo calculations using the MCNP5 code. This method aims at allowing for an accurate quantitative determination of activity concentrations in marine sediments (using the in situ system), which can be applied in different areas and for variable sediment structures.As a first step, the MCNP5 code has been successfully applied for the standard 4π geometry in the aquatic environment, reproducing results of the marine efficiency as previously deduced by the GEANT4 code. The experimental set up geometry was introduced in MCNP5 using detailed information for the geometry and the materials. Moreover, a first simulated estimation of the in situ efficiency for sediment measurements is presented for 40K (1460.8 keV). For this purpose a new model was constructed taking into account a typical experimental geometry set-up (with the detector being situated in close contact with the seabed). In order to validate the Monte-Carlo results, activity measurements were also performed in sediment samples collected from Basilica, Cyprus, where the in situ system was deployed. The samples were analysed using a HPGe detector for inter-calibration purposes and the obtained results are discussed.

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