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Computed neutron tomography from real-time radiographic images
Paris (France), 16-20 Jun. 1986. pp. 849-856. D. Reidel Publishing Company Up till now no reliable radiographic image quality standards existed for neutron radiography of nuclear reactor fuel. Under the Euratom Neutron Radiography Working Group (NRWG) Test Program neutron radiographs of a calibration fuel pin were produced at different neutron radiography facilities within the European Community. The radiographs were made by the direct, transier and track-etch methods using different film recording materials. These neutron radiographs of the calibration fuel pin were used for assessment of the radiographic image quality. This was done by visual examination of the radiographs and assessing their radiographic image quality on an arbitrary scale.
radiographs of an object as well as multiple projections of the transmitted neutron beam through the object using an He-3 proportional counter. Gamma-ray transmission tomography employing the 60 keV gamma- ray line of a well-collimated Am-241 source was also applied to the same object. A 35 mm camera was modified to incorporate a neutron converter so that sequential radiographs could be obtained without disturbing the geometrical arrangement between beam, object and recording medium. A conventional converter/film combination, in one single cassette, was also used. Results show that the technique using the collimated He-3 neutron detector provides tomographic images which are superior in terms of contrast and noise due to statistical fluctuation.
37874
37868
Domanus, J.C.
Rizo, P.
Can neutron beam components and radiographic image quality be determined by the use of beam purity and sensitivity indicators
Tomography using neutron radiography photographs for a beam of several fuel pins
Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 839-848. D. Reidel Publishing Company In the Euratom Neutron Radiography Working Group Test Program beam purity and sensitivity indicators were used together with the a beam purity indicator-fuel and calibration fuel pin. They were radiograplied together at neutron radiography facilities of the European Community. The direct, transfer and track-etch methods using different film recording materials were used. Neutron beam components were calculated from film density measurements under the beam purity indicators and radiographic image quality was assessed by visual examination of the sensitivity indicator. Results obtained under the Test Program are summarized and compared.
Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 703-710. D. Reidel Publishing Company A method of tomography by neutron radiography has been developed at the Centre d'Etudes Nucleaires de Grenoble (Grenoble Centre for Nuclear Studies) with a view to examining beams of several fuel pins during irradiation. During this study, the emphasis was laid on establishing a physical model of the neutron radiography measurements, so as to enable appropriate codes of reconstruction to be written. Conditions for the use of classical reconstruction codes were also studied after appropriate processing of the readings.
37873
Kobayashi, H.; Tomura, K.
Enhancement of Image contrast by combination of neutron and X-ray radiography Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 791-798. D. Reidel Publishing Company Images of X-ray radiography and thermal neutron radiography are theoretically analyzed for an object with local irregularities in atomic composition. Physical meanings of the new combined images are discussed. The image combination method is applied to resolve the measured images of enamel and dentin in a slice of tooth. 37872
Sulcoski, M.F.; Brenizer, J.S.
Computed neutron tomography from real-time radiographic images Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 753-760. D. Reidel Publishing Company A real-time neutron radiography facility was constructed including the capability for neutron tomography. A tomography algorithm, using the convolution method, was programmed on an Intellect 100 Image Processing System. The method produced results near the theoretical resolution limits for a gwen number of projections. A tomographic resolution of at least 1.3 mm was demonstrated using 200 projections. Computer running time for the convolution method was found to be about 30 seconds for each projection used. 37871
37867
Alreja, V.; Corso, L.
Dedicated imaging system for real-time neutron radiography Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 625-634. D. Reidel Publishing Company This paper describes the principles of an image intensifier based real- time system, as well as the basis for selecting components to produce a state of the art imaging system capable of high contrast and resolution standards. Various components or sub-systems are discussed, and advantages and limitations of the system are enumerated.
Ono, A.; Sonoda, K.; Taniguchi, R.; Hiraoka, E.; Nakanii, T.; Tazawa, S.; Asada, Y.; Yano, M.; Hayashi, K.; Hosokawa, T.
37866
Application of cyclotron-based real-time neutron radiography system for some industrial components Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 609-616. D. Reidel Publishing Company A reliable cyclotron-based real-time neutron radiography system has been developed and applied to some industrial components. The equipment for neutron fluoroscopy is based on a sub-compact cyclotron and a LiF/ZnS(Ag) fluorescent screen viewed by a silicon intensifier target television camera. The real-time image is monitored, recorded with a standard video recorder and processed by a digital image processor. The effectiveness of real-time neutron radiograph has been demonstrated to be applicable to not only dynamic observation but also the magnifying and stereoscopic observation of fluoroscopic images. The results are presented on photos and video tape.
Matsumoto, G.; Sendo, T.; Honda, S.; Ohkubo, K.; Ikeda, Kanda, K.; Fujine, S.; Yoneda, K.
Y.
37865
Improvement of reconstructed image quality in neutron CT
KUR Neutron television system
Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 745-752. D. Reidel Publishing Company Improvement in neutron computed tomography (CT) techniques were tested using an automatic CT camera and image input equipment attached to a large scale computer. Neutron CT using Neutron Television was also carried out by a high speed image processor. The time needed for inputting optical density data from films for computational reconstruction of CT images was greatly reduced by 1/40 compared to the previous method, using a microdensitometer, the image quality was improved appreciably. By using Neutron Television, the process time for CT was further shortened, and the images obtained were fairly good.
Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 601-608. D. Reidel Publishing Company A neutron television system has been installed at the E-2 experimental hole of the KUR (Kyoto University Reactor, 5 MW), including an online video processing system. The video image signals from the television camera are digitized through a video converter and can he stored in the image buffer of a microcomputer system. The image can be treated in various ways according to the purposes of experiments. Some applications using this system and further studies in progress are described in this paper.
37870
Yoneda, K.; Fujine, S.; Kanda, K.
Neutron computed tomography using the neutron television system Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 739-744. D. Reidel Publishing Company At the Kyoto University Reactor (KUR), it is possible to apply neutron television (NTV) to neutron computed tomography (NCT). The characteristics of the system can be acquired in a single measurement and simultaneously the projection image can be observed on a CRT monitor. The data was sampled from an optional horizontal scanning line at the video image, and was calculated by an on-line personal computer. The Fourier-convolution technique is used to produce the reconstructed image and its image has a good enough quality for revealing water in a small hole of 1.5 mm in diameter. 37869 Spyrou, K.; Spyrou, N.M. Imaging with neutrons in transmission tomography Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 719-728. D. Reidel Publishing Company Reconstructive tomography was carried out using multiple neutron
246
37864
Harris, D.H.C.; Seymour, W.A.J.
Applications of real time neutron radiography at Harweil Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 595-600. D. Reidel Publishing Company There are two areas of application of real time neutron radiography at Harwell. In the first area the technique is used to observe dynamic events such as liquid or gas flow in operating systems. Secondly real time imaging is used to inspect objects under examination and to select the best view for subsequent screen film radiography. The dynamic work is illustrated by showing studies of the flow patterns which occur when a preheated stainless steel tube is quenched by water. The results obtained have been used to improve film boiling theories used in reactor safety analysis codes. The real time inspection work shown is of an archaeological investigation of the contents of a Saxon container. The examples are presented on video tape as well as in 'still' form in the text below. 37863
Polichar, R.; Shreve, D.
Processing of real-time images for quantitative neutron radiography Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 587-594. D. Reidel Publishing Company
NDT International August 1989
radiographs of an object as well as multiple projections of the transmitted neutron beam through the object using an He-3 proportional counter. Gamma-ray transmission tomography employing the 60 keV gamma- ray line of a well-collimated Am-241 source was also applied to the same object. A 35 mm camera was modified to incorporate a neutron converter so that sequential radiographs could be obtained without disturbing the geometrical arrangement between beam, object and recording medium. A conventional converter/film combination, in one single cassette, was also used. Results show that the technique using the collimated He-3 neutron detector provides tomographic images which are superior in terms of contrast and noise due to statistical fluctuation.
37874
37868
Domanus, J.C.
Rizo, P.
Can neutron beam components and radiographic image quality be determined by the use of beam purity and sensitivity indicators
Tomography using neutron radiography photographs for a beam of several fuel pins
Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 839-848. D. Reidel Publishing Company In the Euratom Neutron Radiography Working Group Test Program beam purity and sensitivity indicators were used together with the a beam purity indicator-fuel and calibration fuel pin. They were radiograplied together at neutron radiography facilities of the European Community. The direct, transfer and track-etch methods using different film recording materials were used. Neutron beam components were calculated from film density measurements under the beam purity indicators and radiographic image quality was assessed by visual examination of the sensitivity indicator. Results obtained under the Test Program are summarized and compared.
Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 703-710. D. Reidel Publishing Company A method of tomography by neutron radiography has been developed at the Centre d'Etudes Nucleaires de Grenoble (Grenoble Centre for Nuclear Studies) with a view to examining beams of several fuel pins during irradiation. During this study, the emphasis was laid on establishing a physical model of the neutron radiography measurements, so as to enable appropriate codes of reconstruction to be written. Conditions for the use of classical reconstruction codes were also studied after appropriate processing of the readings.
37873
Kobayashi, H.; Tomura, K.
Enhancement of Image contrast by combination of neutron and X-ray radiography Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 791-798. D. Reidel Publishing Company Images of X-ray radiography and thermal neutron radiography are theoretically analyzed for an object with local irregularities in atomic composition. Physical meanings of the new combined images are discussed. The image combination method is applied to resolve the measured images of enamel and dentin in a slice of tooth. 37872
Sulcoski, M.F.; Brenizer, J.S.
Computed neutron tomography from real-time radiographic images Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 753-760. D. Reidel Publishing Company A real-time neutron radiography facility was constructed including the capability for neutron tomography. A tomography algorithm, using the convolution method, was programmed on an Intellect 100 Image Processing System. The method produced results near the theoretical resolution limits for a gwen number of projections. A tomographic resolution of at least 1.3 mm was demonstrated using 200 projections. Computer running time for the convolution method was found to be about 30 seconds for each projection used. 37871
37867
Alreja, V.; Corso, L.
Dedicated imaging system for real-time neutron radiography Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 625-634. D. Reidel Publishing Company This paper describes the principles of an image intensifier based real- time system, as well as the basis for selecting components to produce a state of the art imaging system capable of high contrast and resolution standards. Various components or sub-systems are discussed, and advantages and limitations of the system are enumerated.
Ono, A.; Sonoda, K.; Taniguchi, R.; Hiraoka, E.; Nakanii, T.; Tazawa, S.; Asada, Y.; Yano, M.; Hayashi, K.; Hosokawa, T.
37866
Application of cyclotron-based real-time neutron radiography system for some industrial components Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 609-616. D. Reidel Publishing Company A reliable cyclotron-based real-time neutron radiography system has been developed and applied to some industrial components. The equipment for neutron fluoroscopy is based on a sub-compact cyclotron and a LiF/ZnS(Ag) fluorescent screen viewed by a silicon intensifier target television camera. The real-time image is monitored, recorded with a standard video recorder and processed by a digital image processor. The effectiveness of real-time neutron radiograph has been demonstrated to be applicable to not only dynamic observation but also the magnifying and stereoscopic observation of fluoroscopic images. The results are presented on photos and video tape.
Matsumoto, G.; Sendo, T.; Honda, S.; Ohkubo, K.; Ikeda, Kanda, K.; Fujine, S.; Yoneda, K.
Y.
37865
Improvement of reconstructed image quality in neutron CT
KUR Neutron television system
Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 745-752. D. Reidel Publishing Company Improvement in neutron computed tomography (CT) techniques were tested using an automatic CT camera and image input equipment attached to a large scale computer. Neutron CT using Neutron Television was also carried out by a high speed image processor. The time needed for inputting optical density data from films for computational reconstruction of CT images was greatly reduced by 1/40 compared to the previous method, using a microdensitometer, the image quality was improved appreciably. By using Neutron Television, the process time for CT was further shortened, and the images obtained were fairly good.
Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 601-608. D. Reidel Publishing Company A neutron television system has been installed at the E-2 experimental hole of the KUR (Kyoto University Reactor, 5 MW), including an online video processing system. The video image signals from the television camera are digitized through a video converter and can he stored in the image buffer of a microcomputer system. The image can be treated in various ways according to the purposes of experiments. Some applications using this system and further studies in progress are described in this paper.
37870
Yoneda, K.; Fujine, S.; Kanda, K.
Neutron computed tomography using the neutron television system Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 739-744. D. Reidel Publishing Company At the Kyoto University Reactor (KUR), it is possible to apply neutron television (NTV) to neutron computed tomography (NCT). The characteristics of the system can be acquired in a single measurement and simultaneously the projection image can be observed on a CRT monitor. The data was sampled from an optional horizontal scanning line at the video image, and was calculated by an on-line personal computer. The Fourier-convolution technique is used to produce the reconstructed image and its image has a good enough quality for revealing water in a small hole of 1.5 mm in diameter. 37869 Spyrou, K.; Spyrou, N.M. Imaging with neutrons in transmission tomography Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 719-728. D. Reidel Publishing Company Reconstructive tomography was carried out using multiple neutron
246
37864
Harris, D.H.C.; Seymour, W.A.J.
Applications of real time neutron radiography at Harweil Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 595-600. D. Reidel Publishing Company There are two areas of application of real time neutron radiography at Harwell. In the first area the technique is used to observe dynamic events such as liquid or gas flow in operating systems. Secondly real time imaging is used to inspect objects under examination and to select the best view for subsequent screen film radiography. The dynamic work is illustrated by showing studies of the flow patterns which occur when a preheated stainless steel tube is quenched by water. The results obtained have been used to improve film boiling theories used in reactor safety analysis codes. The real time inspection work shown is of an archaeological investigation of the contents of a Saxon container. The examples are presented on video tape as well as in 'still' form in the text below. 37863
Polichar, R.; Shreve, D.
Processing of real-time images for quantitative neutron radiography Neutron Radiography, Proceedings of the Second World Conference, Paris (France), 16-20 Jun. 1986. pp. 587-594. D. Reidel Publishing Company
NDT International August 1989