Archaeometric studies by neutron, x-ray radiography and microCT

Latini, Rose Mary; Bellido, A. V. B.; Filho, U. M. Vinagre; Souza, Maria Ines Silvani; Lima, I.; Oliveira, Davi F.; Lopes, Rogério

doi:10.1063/1.4804080

Cited by 2 publications

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“…For this purpose, neutron radiation will likely be important, because X-rays and γ -rays, unlike neutrons, exhibit low penetration into heavy-element materials. [5][6][7] Because neutrons are captured by hydrogen atoms, neutron radiation will be useful for nondestructive fluid analysis of the interiors of engine blocks 8 or inspection of structural changes in batteries. However, new methods of high-speed and high-resolution neutron detection are necessary for such real-time imaging.…”

confidence: 99%

Neutron detection using boron gallium nitride semiconductor material

Atsumi¹,

Inoue²,

Mimura³

et al. 2014

APL Materials

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In this study, we developed a new neutron-detection device using a boron gallium nitride (BGaN) semiconductor in which the B atom acts as a neutron converter. BGaN and gallium nitride (GaN) samples were grown by metal organic vapor phase epitaxy, and their radiation detection properties were evaluated. GaN exhibited good sensitivity to α-rays but poor sensitivity to γ-rays. Moreover, we confirmed that electrons were generated in the depletion layer under neutron irradiation. This resulted in a neutron-detection signal after α-rays were generated by the capture of neutrons by the B atoms. These results prove that BGaN is useful as a neutron-detecting semiconductor material.

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confidence: 99%

Neutron detection using boron gallium nitride semiconductor material

Atsumi¹,

Inoue²,

Mimura³

et al. 2014

APL Materials

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“…Palette technique exhibits a homogeneous mass and rollers technique exhibits horizontal traces from the junction of rollers, overlapping, forming layers supported on each other and smoothed to obtain a homogeneous surface. Previous works with radiographic images [1,2] have show possibilities for identifying these differences. But image interpretations are quite subjective in certain limits so we are trying to understand these by using test objects and computer methods.…”

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confidence: 99%

Manufacturing techniques studies of ceramics by neutron and γ-ray radiography

Latini¹,

Souza²,

Almeida³

et al. 2014

AIP Conference Proceedings

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Abstract. In this study, the aim was to evaluate capabilities and constraints of radiographic imagery using thermal neutrons and gamma-rays as tools to identify the type of technique employed in ceramics manufacturing especially that used in prehistoric Brazilian pottery from Acre state. For this purpose, radiographic images of test objects made with clay of this region using both techniques -palette and rollers -have been acquired with a system comprised of a source of gamma-rays or thermal neutrons and a corresponding X-ray or neutron-sensitive Imaging Plate as detector. For the neutrongraphy samples were exposed to a thermal neutron flux of order of 10 5 n.cm -2 .s -1 for 3 minutes at main port of Argonauta research reactor of the Instituto de Engenharia Nuclear -IEN/CNEN. The radiographic images using γ-rays from 165 Dy (95 keV) and 198 Au (412 keV) both produced at this reactor, have been acquired under an exposure time of a couple of hours. After acquisition, images have undergone a treatment to improve their quality through enhancement of their contrast, a procedure involving corrections of the beam divergence, sample shape and averaging of the attenuation map profile. Preliminary results show that difference between manufacturing techniques is better identified by radiography using low energy γ-rays from 165 Dy rather than neutrongraphy or γ-rays from 198 Au. Nevertheless, disregarding the kind of employed radiation, it should be stressed that feasibility to apply the technique is tightly tied to homogeneity of the clay itself and tempers due to their different attenuation.

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Archaeometric studies by neutron, x-ray radiography and microCT

Cited by 2 publications

References 0 publications

Neutron detection using boron gallium nitride semiconductor material

Neutron detection using boron gallium nitride semiconductor material

Manufacturing techniques studies of ceramics by neutron and γ-ray radiography

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