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1
Content available Conversion of fast neutrons for neutron radiography with TPX2 detector
Šagátová Andrea, Fülöp Marko, Novák Andrej, Vrban Branislav, Lüley Jakub, Čerba Štefan, Benkovský Ivan, Zaťko Bohumír
Nukleonika
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2024
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Vol. 69, No. 2
135--140
EN
The Timepix2-based hybrid-pixel detector with a 500 m thick silicon sensor was employed for fast-neutrons registration to be applied in neutron radiography of metallic printed circuit heat exchanger (PCHE). Two energies of neutrons were experimentally tested. The detection of 3.55 MeV neutrons from the deuteron-deuteron (DD) reaction was compared to 15.7 MeV neutrons from the deuteron–tritium (DT) neutron generator. In order to distinguish the signal induced by the registered neutrons from the accelerator background, filtration of the recorded particle spectral tracks was applied. The benefit of applying hydrogen-based converter layer for 3.55 MeV neutrons was observable. On the other hand, in the case of 15.7 MeV neutrons, the direct registration by interaction with the sensor Si significantly dominates the conversion.
2
Content available Studies on water transport in quasi two-dimensional porous systems using neutron radiography
Fijał-Kirejczyk Izabela M., Rogante Massimo, Milczarek Jacek J., Żołądek-Nowak Joanna, Jurkowski Zdzisław, Żołądek Jan, Rusinek Dariusz
Nukleonika
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2022
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Vol. 67, No. 1
3--9
EN
The spontaneous wetting and drying of flat porous samples of linen, cotton and synthetic textiles were studied using dynamic neutron radiography (DNR). The progress of the wetting process of the media was delineated from the obtained neutron dynamical radiography images. The results of the investigation reveal a non-classical behaviour of kinetics of wicking of these materials. The character of the wetting kinetics is discussed in terms of the fractal character of the tortuosity of fabric capillaries.
3
Próby rekonstrukcji obrazu fotograficznego na podłożach papierowych. Cz. 3.
Kozielec T.
Przegląd Papierniczy
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2017
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R. 73, nr 5
349--356
PL
W artykule zaprezentowano wyniki badań nad rekonstrukcją obrazu fotograficznego z użyciem technik: obrazowania wielospektralnego, neutronowego (radiografia neutronowa) oraz obrazowania z wykorzystaniem technik opartych na użyciu promieniowania rentgenowskiego (MA-XRF, RTG). Zastosowano również techniki oparte na użyciu skaningowego mikroskopu elektronowego SEM/BSE i SEM/EDX. Określono, że najbardziej przydatną techniką do rekonstrukcji spłowiałego obrazu fotograficznego jest obrazowanie wielospektralne (widmo niebieskie i początek widma zielonego). Wszystkie pozostałe techniki nie powodują uczytelnienia się srebrowego obrazu fotograficznego. Zwrócono jednak uwagę na ich przydatność do innych rodzajów badań zabytkowych fotografii. Niniejsza część artykułu jest ostatnią – zamyka poruszoną problematykę badawczą, na której skupił się autor, z drugiej jednak strony ma ona za zadanie otworzenie drogi do dalszych poszukiwań.
EN
In this article the results of photographic image reconstruction investigation are discussed. The following techniques were used in this investigation: multispectral imaging, neutron imaging (neutron radiography) and X radiation techniques (MA-XRF, RTG). The techniques using scanning electron microscopy SEM/BSE and SEM/EDX were also applied. It was found that the most suitable method of faded image reconstruction was multispectral imaging. Other mentioned techniques did not cause the improvement of photographic image readibility. However, they are very useful in other kinds of historic photographs investigation. It is the last part of the article summing up the issues of author’s interest. On the other hand the goal of this part was to open the way for further research.
4
Content available remote Regularized Total Variation Image Enhancement Using E.Coli Bacteria Foraging Algorithm: Application to Neutron Radiography Projections
Saadi S., Bettayeb M., Guessoum A.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 3b
192-196
EN
This paper proposes a novel approach based on swarm intelligence and foraging behavior of Escherichia coli Bacteria in the human intestine for enhancing neutron radiography projections blurred during acquisition by the high neutron flux and noise contaminated due to Gamma radiations. This approach uses the total variation (TV) optimization to solve an ill-posed problem. We consider a regularization operator for smoothing task. In comparison with other efficient methods, the proposed Algorithm can be suitable for image enhancement and noise removal.
PL
W artykule zaproponowano wykorzystaniu algorytmu rojowego bazującego na zachowaniu bakterii E.coli do poprawy jakości projekcji radiograficznej. W porównaniu z innymi algorytmami ta metoda charakteryzuje się dobrą możliwością poprawy jakości obrazu i usuwania szumu.
5
Content available remote FPGA Embedded Implementation for Neutron Radiography Images Restoration Based on Tikhonov and TV Algorithms
Saadi S., Guessoum M., Bettayeb M.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 11a
322-326
EN
In this paper, we present a mixed software/hardware Implementation for image restoration using Tikhonov and Total Variations (TV) approaches. The proposed work is implemented and compiled on the embedded development kit EDK6.3i and the synthesis software ISE6.3i available with Xilinx Virtex-II FPGA using C language. The proposed implementation is designed to be integrated in the whole imaging system and image enhancement results have been appreciated by neutron radiography final users. The design can significantly accelerate the two Algorithms.
PL
W artykule przedstawiono zastosowanie metod Tikhonova oraz Odchylenia Całkowitego w algorytmie odtwarzania obrazu. Do implementacji w języku C, wykorzystano płytę rozwojową EDK 6.3i z układem FPGA Virtex II Pro firmy Xilinx wraz z oprogramowaniem ISE 6.3i.
6
Content available Dynamic neutron radiography studies of drying of kaolin clay cylinders
Fijał-Kirejczyk I., Milczarek J. J., Banaszak J., Trzciński A., Żołądek J.
Nukleonika
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2009
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Vol. 54, No. 2
123-128
EN
The results of neutron radiography studies on convective drying of kaolin cylinders are presented. The sample shrinkage and loss of water during drying was easily observed on registered neutron radiograms. The saturation of the sample with water was estimated in terms of the neutron effective macroscopic cross-section. The results are comparable to those of gravimetric measurements and are discussed within the framework of simple theories of drying. The effect of the scattered neutrons is discussed in terms of the results of the MC simulations.
7
Content available Dynamic neutron radiography studies of water migration in beds of natural zeolite
Żołądek J., Milczarek J. J., Fijał-Kirejczyk I.
Nukleonika
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2008
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Vol. 53, suppl. 2
113--119
EN
The results of the experiments on water migration in unsaturated beds of natural zeolite (clinoptilolite) performed with a dynamic neutron radiography technique are presented. It was found that the migration of water in zeolites is much slower than in quartz sand composed of the same size grains. The effect is attributed to the enormous grain surface roughness of the zeolite. The influence of gravity was found to be significant only for beds formed by the coarsest grains. It was found that the water imbibition rate increases with time in finest grain zeolite beds. The results show the difficulties of the classical theory of adhesion driven motion of the liquid in the single capillary as a model of water imbibition by zeolite beds.
8
Radiografia neutronowa
Jezierski G.
Dozór Techniczny
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2008
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z. 4
88--95
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