&lt;title&gt;Thermal neutron imaging using microchannel plates&lt;/title&gt;

Fraser, George W.; Pearson, James F.; Al-Horayess, Okla S.; Feller, W. Bruce; Cook, Lee M.

doi:10.1117/12.138671

Cited by 22 publications

(5 citation statements)

References 14 publications

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“…1). The few nuclides that are useful for thermal neutron detection and can be considered as candidates for the glass mixture include 6 Li, 10 cross sections of 259000 and 61100 barns, respectively) and was only 0.6 mm thick.…”

Section: Introductionmentioning

confidence: 99%

The theory of compact and efficient circular-pore MCP neutron collimators

Tremsin¹,

Feller²

2006

Nuclear Instruments and Methods in Physics Research Section A:

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A novel type of thermal and cold neutron collimators based on microchannel plates (MCPs) doped with neutron absorbing atoms is discussed. Opposite to widely used Soller slit collimators, the microchannel plates collimate a beam of neutrons in 2 dimensions simultaneously and they are very compact. A detailed model of the circular-pore MCP collimator performance, described in this paper, can be used for optimization of MCP parameters in order to achieve the most efficient collimation for a given application.Among these parameters are the MCP geometrical dimensions, the type of absorbing atoms and their concentration in the MCP glass mixture, all constrained by the manufacturing limitations. The model predicts that the MCP collimators can be very efficient (rocking curve <0.1 o wide with high background suppression in the wings) and very compact (only few mm thick). In addition to collimation, the same microchannel plates can also be used for neutron imaging with a high spatial (~20 µm) and temporal * Corresponding author. E-mail address: ast@ssl.berkeley.edu (A.S. Tremsin) (~1 µs) resolution, opening up new possibilities for simultaneous beam collimation and monitoring.

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Section: Introductionmentioning

confidence: 99%

The theory of compact and efficient circular-pore MCP neutron collimators

Tremsin¹,

Feller²

2006

Nuclear Instruments and Methods in Physics Research Section A:

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“…Neutron radiography is a powerful tool for non-destructive testing of materials for industrial application and research, but conventional MCP cannot be used to detect neutron directly since in which substrate no these nuclide content to convert neutron into utilizable charged or energetic particle. Fraser and Pearson first suggested that the direct addition of boron into the MCP structure could substantially enhance MCP neutron sensitivity [10,11], therefore all the advantage of spatial and temporal resolution in MCP event counting detector can be successfully applied to the field of neutron radiography. The MCPs doped with 10 B or/and nat Gd were first implemented successfully by Feller et al at Nova Scientific [12], an initial tests were done at the NIST National Center for Neutron Research(NCNR) shows the detection efficiencies of the MCP doped with 10 B or nat Gd is 16% and 18% for thermal neutrons, respectively [6,13], the detection efficiency of latest Nova HB-4 MCP can exceed 50% for thermal neutron, while the spatial resolution can be better than 20 µm FWHM, the capability of time resolution of ∼1 µs, and the virtual absence of readout noise in existing readout electronics [14,15].…”

Section: Jinst 8 P01015mentioning

confidence: 99%

High detection efficiency neutron sensitive microchannel plate

et al. 2013

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Direct addition of neutron-absorbing atoms into MCP glass, such as 10 B and 155,157 Gd, without changing the remainder of MCP fabrication process, can make MCP sensitive to neutrons. Since the much larger cross section of 157 Gd, the MCP doped with nat Gd 2 O 3 is more efficient than one doped with enriched 10 B 2 O 3 , theoretical indicates that the detection efficiency of a MCP doped with 3 mole% of nat Gd 2 O 3 is equivalent even superior to a MCP doped with 20 mole% of 10 B 2 O 3 . In this paper a 50 mm diameter rimless format 10 µm pore diameter MCP doped with 3 mole% nat Gd 2 O 3 was fabricated, but the MCP glass doped with 20 mol% of nat B 2 O 3 failed to pass through the corrosive chemical processing necessary in MCPs manufacture. A primary experimental tests proved the MCP doped with 3 mole% nat Gd 2 O 3 is capable of imaging thermal neutrons with 35% detection efficiency. A potential of enhancement on detection efficiency should be achieved for a optimized geometry MCP with an appropriate selection between bias angle, open area ratio and length to diameter ratio.

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“…A new-type of thermal neutron sensitive MCP (nMCP) is proposed to achieve a higher detection efficiency and a better spatial resolution for TNR [5][6][7][8]. As figure 1 shows, the geometry of the nMCP is similar to the traditional MCP while its substrate is the glass doped with thermal neutron sensitive elements (such as 10 B).…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulation of ¹⁰B doped thermal neutron sensitive microchannel plate

Ma¹,

Wang²,

Huang³

et al. 2018

J. Inst.

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In this paper, the Geant4 Monte Carlo simulation is proposed to evaluate the response of the 10 B doped thermal neutron sensitive microchannel plate (nMCP). The detection efficiency and the spatial resolution of the nMCP in various geometrical configurations are simulated. Simulation results indicate that the 10 B doped nMCP can provide a sufficiently high detection efficiency and spatial resolution for 0.025eV thermal neutron detection. The efficiency of the nMCP increases with its thickness along with bias angle as a contributing factor. The spatial resolution of the no biased nMCP is decided by its channel diameter while the spatial resolution of the biased nMCP is determined by its thickness, channel diameter and bias angle. When the thickness of the nMCP is 1mm, a detection efficiency of 16% with a spatial resolution of 35 µm can be achieved when the channel diameter of the 2 • biased nMCP is 30 µm and its channel wall thickness is 2 µm.

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<title>Thermal neutron imaging using microchannel plates</title>

Cited by 22 publications

References 14 publications

The theory of compact and efficient circular-pore MCP neutron collimators

The theory of compact and efficient circular-pore MCP neutron collimators

High detection efficiency neutron sensitive microchannel plate

Monte Carlo simulation of ¹⁰B doped thermal neutron sensitive microchannel plate

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<title>Thermal neutron imaging using microchannel plates</title>

Cited by 22 publications

References 14 publications

The theory of compact and efficient circular-pore MCP neutron collimators

The theory of compact and efficient circular-pore MCP neutron collimators

High detection efficiency neutron sensitive microchannel plate

Monte Carlo simulation of 10B doped thermal neutron sensitive microchannel plate

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Monte Carlo simulation of ¹⁰B doped thermal neutron sensitive microchannel plate