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Arayaprecha, W.
Department of Nuclear Technology, Chulalongkorn Univ., Bangkok (Thailand)1979
Department of Nuclear Technology, Chulalongkorn Univ., Bangkok (Thailand)1979
AbstractAbstract
[en] Currently, X-rays radiography has been used extensively in various industries. In this thesis, X-rays has been used in the study of compaction of rocket propellant. For a rocket, to gain an accurate guidance result, the propellant used must be mixed and compacted thoroughly. The quality control of the production of propellant sticks must be carefully done. In this study of non-destructive quality testing of rocket propellant, at first the ultrasonic rays was used to test its homogeneity. However, because the density of the propellant was too low, the test equipment could not detect any reflected signals from the propellant being tested. Then the new procedure using X-rays radiography was tried. The variables in the test procedure were voltage, amperage and the focal-film distance. Also different types of films were used. The results of this experiment were then used to construct an exposure chart for testing the homogeneity of the rocket propellant. The advantage of this chart is that a tester can use this table with propellant sticks of different sizes if they have similar density to the density specified in the chart. Also, it is not necessary that the mixture of the testing propellant be the same as the ones used to construct this chart
Primary Subject
Source
1979; 66 p; Chulalongkorn Univ; Bangkok (Thailand); Available from Graduate School, Chulalongkorn Univ., Bangkok (TH); Thesis (Master Eng.)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation; Numerical Data
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Suksawang, P.
Department of Nuclear Technology, Chulalongkorn Univ., Bangkok (Thailand)1981
Department of Nuclear Technology, Chulalongkorn Univ., Bangkok (Thailand)1981
AbstractAbstract
[en] The object of this study was to design and construct a neutron radiography device and investigate its capacity for detecting an internal structure of sample. Thai Research Reactor-1/Modification 1 was used as the neutron source and the thermal neutron flux for neutron radiography was 2.91 x 106 neutron-cm-2-sec-1. The direct technique was performed by using single intensifying screen of gadolinium (0.001 in) behind Kodak Industrex AA film and exposure time was about 100-150 sec. The neutron radiograph showed clearly the powder in the bullets. The indirect technique was also performed by using both indium (0.01 in) and dysprosium (0.001 in) as intensifying screen respectively and the neutron radiograph showed some details of the internal of Ir-192 source. In conclusion, any nuclear reactor equipped with probe tube and capable of operating at power greater than 1 k W may be useful for neutron radiography. In addition, neutron radiography has been shown to provide and imaging capability where X-radiography is not practical
Primary Subject
Secondary Subject
Source
1981; 176 p; Chulalongkorn Univ; Bangkok (Thailand); Available from Graduate School, Chulalongkorn Univ., Bangkok (TH); Thesis (Master Eng.)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation; Numerical Data
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Ngernvijit, N.
Chulalongkorn Univ., Bangkok (Thailand). Dept. of Nuclear Technology1988
Chulalongkorn Univ., Bangkok (Thailand). Dept. of Nuclear Technology1988
AbstractAbstract
[en] In this research, measurements of the coating thickness of gold on copper plates and tin on steel plates were studied by using beta backscattering and X RF techniques. A x e-filled proportional counter was used for fluorescent x-ray measurements while the samples were excited with Fe-55 and Cd-109 annular sources. It was found that the thicknesses of gold in the range of 0-8 microns and tin in the range of 0.534-1.49 microns can be measured with the error of less than 2%. A Sr90 annular source and a G M counter were used for beta backscattering technique. It was found that the thickness of gold in the 0-8 microns can be measured with the error of less than 10.2%. However, the measurement of tin thickness could not be done successfully because the thickness of steel plates were less than its critical thickness for Sr90 betas
Primary Subject
Source
1988; 80 p; Chulalongkorn University; Bangkok (Thailand); ISBN 974-569-045-7;
; Available from Graduate School, Chulalongkorn Univ., Bangkok (TH); Thesis (Master Eng.)

Record Type
Miscellaneous
Literature Type
Thesis/Dissertation; Numerical Data
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Sumitra, T.; Chankow, N.; Punnachajya, S.
Proceedings of the 6th nuclear science and technology conference1996
Proceedings of the 6th nuclear science and technology conference1996
AbstractAbstract
[en] Nuclear techniques have been widely used in Thai industries and has increased gradually over the years. At present, about 240 licenses for a total activity of 180,045 curies of radioisotopes are issued to the users in industry. The nuclear techniques are mostly used for nondestructive testing of materials, thickness gauging and elemental analysis using the x-ray fluorescence technique. There is still a shortage of well-trained personnel in the Thai industries to supervise the proper use of nuclear instruments efficiently and safely. Decision making in using nuclear techniques is usually done by the foreign counterparts rather than their Thai partners
Primary Subject
Source
Office of Atomic Energy for Peace, Bangkok (Thailand); 761 p; Dec 1996; [10 p.]; 6. Conference on Nuclear Science and Technology; Bangkok (Thailand); 2-4 Dec 1996; ALSO AVAILABLE FROM OFFICE OF ATOMIC ENERGY FOR PEACE, BANGKOK (THAILAND)
Record Type
Miscellaneous
Literature Type
Conference; Numerical Data
Report Number
Country of publication
Reference NumberReference Number
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Sonsuk, M.; Wantanapan, N.
Chemistry Div., Office of Atomic Energy for Peace, Bangkok (Thailand)1997
Chemistry Div., Office of Atomic Energy for Peace, Bangkok (Thailand)1997
AbstractAbstract
[en] Carbon-14 dating was used to determine the age of charcoal and snail samples collected from excavation site at Muang Fa Daed Song Yang, Kamalasai district, Kalasin province and gives an age range from 890 to 2240 yr.b.p.. The sample collection and pretreatment, processing of a sample until it is in a suitable from for counting, the counting technique and age calculation are also discussed
Primary Subject
Source
Jun 1997; 21 p; ISBN 974-7400-10-3;
; ALSO AVAILABLE FROM OFFICE OF ATOMIC ENERGY FOR PEACE, BANGKOK (THAILAND)

Record Type
Report
Literature Type
Numerical Data
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Chankow, Nares
Radiation and life: Proceedings of the 8. Nuclear Science and Technology Conference (NST8)2001
Radiation and life: Proceedings of the 8. Nuclear Science and Technology Conference (NST8)2001
AbstractAbstract
No abstract available
Primary Subject
Source
Office of Atomic Energy for Peace, Bangkok (Thailand); 1110 p; Jun 2001; p. 228-230; NST8: 8. Conference on nuclear science and technology: Radiation and life; Radiation and life; Bangkok (Thailand); 20-21 Jun 2001; Also available from Office of Atomic Energy for Peace, Bangkok (TH)
Record Type
Miscellaneous
Literature Type
Conference; Numerical Data
Report Number
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Reference NumberReference Number
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Recoquillay, Arnaud
ENSTA-ParisTech, 828 boulevard des Marechaux, 91762 CEDEX Palaiseau (France); Universite Paris-Saclay, Parc technologique, bat Discovery, Route de l'Orme aux Merisiers, 91190 Saint-Aubin (France); CEA, DRT-DISC (France)2018
ENSTA-ParisTech, 828 boulevard des Marechaux, 91762 CEDEX Palaiseau (France); Universite Paris-Saclay, Parc technologique, bat Discovery, Route de l'Orme aux Merisiers, 91190 Saint-Aubin (France); CEA, DRT-DISC (France)2018
AbstractAbstract
[en] Widely used structures in an industrial context, such as plates, pipes or rails, can be considered as waveguides. Hence efficient Non Destructive Testing techniques are needed in order to detect defects in these structure during their maintenance. This work is about adapting a sampling method, the Linear Sampling Method, to the context of NDT for elastic waveguides. This context implies that the solicitations and measurements must be on the surface of the waveguide in a time-dependent regime. A modal and multi-frequency formulation of the LSM, specific to waveguides, has been chosen to solve the problem. This formulation allows an efficient and physical regularization of the inverse problem, which is naturally ill-posed. An optimization of the number of sources and measurements and of their positioning is possible thanks to the methodology used to solve the problem. The scalar case of an acoustic waveguide is considered as a first step, while the vectorial case of an elastic waveguide, more complex by nature, is addressed in a second time.The efficiency of the method is at first tested on artificial data (numerically made), and then on real data obtained from experiments on metallic plates. These experiments show the feasibility of using sampling methods for Non Destructive Testing in an industrial context. In the case when only one solicitation is available, the LSM can not be applied. A completely different approach is then used, which is called the 'exterior' approach, coupling a mixed formulation of quasi-reversibility and a level-set method in order to recover the shape of the defect. (author)
[fr]
De nombreuses structures utilisees industriellement peuvent etre considerees comme des guides d'ondes, comme les plaques, les tuyaux ou encore le rails. La maintenance de ces structures necessite de pouvoir detecter efficacement des defauts internes par le Controle Non Destructif. Nous nous interessons dans ce manuscrit a l'application d'une methode d'echantillonnage, la Linear Sampling Method, au CND des guides d'ondes elastiques, qui en particulier impose des sollicitations et des mesures a la surface du guide en regime temporel. La strategie choisie repose sur une formulation modale et multi-frequentielle de la LSM, specifique aux guides d'ondes, qui permet une regularisation efficace et de nature physique du probleme inverse, qui est par nature mal pose. Cette strategie permet par ailleurs une optimisation du nombre et de la position des emetteurs et des recepteurs. Nous nous limitons dans un premier temps au cas scalaire du guide d'ondes acoustiques, pour ensuite s'attaquer au cas vectoriel, et par consequent plus complexe, du guide d'ondes elastiques. L'efficacite de la methode inverse est dans un premier temps demontree sur des donnees artificielles (obtenues numeriquement), puis sur des donnees reelles obtenues a l'aide d'experiences realisees sur des plaques metalliques. Ces experiences confirment la faisabilite du CND par methode d'echantillonnage dans un cadre industriel. Dans le cas ou une seule sollicitation est realisee, l'utilisation de la LSM est exclu. Nous utilisons une approche tout a fait differente et dite 'exterieure', couplant une formulation mixte de quasi-reversibilite et une methode de lignes de niveau, pour reconstruire le defaut.Original Title
Methodes d'echantillonnage appliquees a l'imagerie de defauts dans un guide d'ondes elastiques
Primary Subject
Secondary Subject
Source
16 Jan 2018; 221 p; 129 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses; Mathematiques Appliquees
Record Type
Report
Literature Type
Thesis/Dissertation; Numerical Data
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Ho, A.C.; Hussein, E.M.A., E-mail: hussein@unb.ca2000
AbstractAbstract
[en] A method is presented for quantifying information obtained from the indications of a Compton scattering nondestructive testing technique. This is achieved by formulating a measurement model, which provides a numerical estimate of the detector response for a given anomaly. Using the measured response function, the location of an anomaly, its size and density are obtained with the aid of the model. The process is demonstrated by quantifying indications obtained from experimental measurements for flaws artificially created in an aluminum block
Primary Subject
Source
S096980430000213X; Copyright (c) 2000 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: Belgium
Record Type
Journal Article
Literature Type
Numerical Data
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] The guided wave mode conversion phenomena were investigated for the NDE of a plate-like structure with thickness variation. The ratios of reflection and transmission (R/T) were measured via the self-calibrating procedure which allows us to obtain experimental guided wave data in a more reliable way regardless of the coupling uncertainty between transducer and specimen. The results on R/T could be used to determine the thickness reduction of the structure. It was shown that not only the incident modes but also the converted ones need to be considered in the self-calibrating guided wave inspection to extract a reasonable correlation between experimental data and the thickness variation. Through this study, the potential of guided wave inspection as a quantitative NDE technique was explored based on the combined concept of self-calibration and multi-mode conversion in guided wave scattering problems
Primary Subject
Secondary Subject
Source
10 refs, 10 figs
Record Type
Journal Article
Literature Type
Numerical Data
Journal
Journal of the Korean Society for Nondestructive Testing; ISSN 1225-7842;
; v. 20(3); p. 206-212

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
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Putaraporn, S.; Arquero, O.; Liawriangrat, S.; Khaweerat, S.; Pimjun, S.; Chongkumt, S.
Radiation and life: Proceedings of the 8. Nuclear Science and Technology Conference (NST8)2001
Radiation and life: Proceedings of the 8. Nuclear Science and Technology Conference (NST8)2001
AbstractAbstract
No abstract available
Primary Subject
Secondary Subject
Source
Office of Atomic Energy for Peace, Bangkok (Thailand); 1110 p; Jun 2001; p. 685-691; NST8: 8. Conference on nuclear science and technology: Radiation and life; Radiation and life; Bangkok (Thailand); 20-21 Jun 2001; Also available from Office of Atomic Energy for Peace, Bangkok (TH)
Record Type
Miscellaneous
Literature Type
Conference; Numerical Data
Report Number
Country of publication
Reference NumberReference Number
Related RecordRelated Record
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