Imaging System For Neutron Radiography Research Articles

Electronic imaging system for neutron radiography at a low power research reactor

This paper describes an electronic imaging system for producing real time neutron radiography from a low power research reactor, which will allow inspections of samples with high efficiency, in terms of measuring time and result analysis. This system has been implanted because of its potential use in various scientific and industrial areas where neutron radiography with photographic film could not be applied. This real time system is installed in neutron radiography facility of Argonauta nuclear research reactor, at the Instituto de Engenharia Nuclear of the Comissão Nacional de Energia Nuclear, in Brazil. It is adequate to perform real time neutron radiography of static and dynamic events of samples.

High sensitivity neutron imaging system for neutron radiography with a small neutron source : Sinha, A.; Bhawe, B.D.; Panchal, C.G.; Shyam, A.; Srinivasan, M.; Joshi, V.M. Nuclear instruments and Methods in Physics Research, Section B, Vol. 108, No. 4, pp. 408–412 (Mar. 1996)

High sensitivity neutron imaging system for neutron radiography with a small neutron source : Sinha, A.; Bhawe, B.D.; Panchal, C.G.; Shyam, A.; Srinivasan, M.; Joshi, V.M. Nuclear instruments and Methods in Physics Research, Section B, Vol. 108, No. 4, pp. 408–412 (Mar. 1996)

High sensitivity neutron imaging system for neutron radiography with a small neutron source : Sinha, A.; Bhawe, B.D.; Panchal, C.G.; Shyam, A.; Srinivasan, M.; Joshi, V.M. Nuclear Instruments and Methods in Physics Research B, Vol. 108, No. 4, pp. 408–412 (Mar. 1996)

High sensitivity neutron imaging system for neutron radiography with a small neutron source : Sinha, A.; Bhawe, B.D.; Panchal, C.G.; Shyam, A.; Srinivasan, M.; Joshi, V.M. Nuclear Instruments and Methods in Physics Research B, Vol. 108, No. 4, pp. 408–412 (Mar. 1996)

Performance characteristics of scintillators for use in an electronic neutron imaging system for neutron radiography

The response of several different scintillator screens to beams of slow neutrons has been investigated using charge-coupled device (CCD)-based and nuvicon imaging systems. The goal of the effort has been to design and develop an electronic neutron imager compatible for use with a neutron radiography system driven by an accelerator that generates intensities of ≈10 6 neutrons cm−2 s−1. The experimental results demonstrated that the LiF/ZnS class of scintillators used with a CCD camera could provide near-real-time images with a dynamic range (i.e., a functional span of optical intensities) of ≳103 and spatial resolution of 2.5 line pairs mm −1. Full details of the experimental arrangements are presented, along with discussions of the scintillator properties, the results of their use in thermal neutron beams, and an assessment of the performance characteristics of the various imaging techniques that were employed.

Neutron radiography with a one-dimensional image sensor having a high linearity range

By a combination of a linear image sensor and a honeycomb collimator, neutron radiography imaging system with wide dynamic range was constructed. Using this system, the effective thermal neutron attenuation coefficients for several materials were evaluated systematically. The imaging system was also used to perform neutron computed tomography as well as to evaluate the CT-value for several metallic samples. The obtained CT values agreed well with the effective neutron attenuation coefficients.

High sensitivity neutron imaging system for neutron radiography with a small neutron source

Although neutron radiography is a very useful NDT technique. its widespread use has been limited due to the lack of a mobile neutron radiography system. One of the major requirements in designing such a system is the development of a low fluence neutron imaging technique. In recent years several groups in France, Japan and the USA have been working on such an imaging system. We report in this paper the development of such a neutron imaging system based on a Li 6F-ZnS scintillator screen using a pair of image intensifier tubes and a charge coupled device. This detector system has been employed to study the feasibility of neutron radiography using low neutron fluences. The main feature of this imaging system is its ability to detect individual neutron scintillation events with a ligh degree of spatial resolution. Details of this imaging system and the preliminary results obtained using a Pu-Be neutron source of strength ≈ 2 × 10 7 n/s are reported in this paper.

Real-time neutron radiography at Texas A&M University

A real-time neutron radiography imaging system has been installed at the Texas A&M University Nuclear Science Center. The system employs a scintillating screen viewed by a low-light TV camera with a front surface mirror placed at 45° to the neutron beam. The key components of the system are the neutron camera and the image capture and processing unit. The neutron camera uses an NE 426 scintillating screen (ZnS), front surface mirror, remote focus and zoom lens, intensified relay optics (IRO) and monochrome CCD television camera. The image capture and processing unit consists of an IBM PC AT-compatible computer, arithmetic frame grabber, frame processor and high-resolution color monitor. The neutron camera is similar to others using a silicon intensified target (SIT) television camera to provide a TV image of the low-level light from a NE 426 screen. The IRO and CCD camera are used in place of the SIT camera. The computer digitizes the TV image (512 × 512 × 8 bit) at a rate of 30 frames/s and provides a variety of image processing functions. The neutron beam has a total neutron flux of 1.2 × 10 7 neutrons/cm 2 s with the TRIGA reactor operating at 1 MW. A remotely operated sample handling devices is used to position an object in the neutron beam.

39925 Development and investigation of a neutron radiography imaging system with a low-pressure multistep chamber : Nuclear instruments and methods in physics research, Vol. A273, No. 2–3, pp. 731–734 (1988)

39925 Development and investigation of a neutron radiography imaging system with a low-pressure multistep chamber : Nuclear instruments and methods in physics research, Vol. A273, No. 2–3, pp. 731–734 (1988)

39925 Development and investigation of a neutron radiography imaging system with a low-pressure multistep chamber Nuclear instruments and methods in physics research, Vol. A273, No. 2–3, pp. 731–734 (1988)

39925 Development and investigation of a neutron radiography imaging system with a low-pressure multistep chamber Nuclear instruments and methods in physics research, Vol. A273, No. 2–3, pp. 731–734 (1988)

Development and investigation of a neutron radiography imaging system with a low-pressure multistep chamber

An imaging system of thermal neutrons for an investigation of digital neutron radiography has been developed and tested. Some characteristics obtained on a neutron radiography beam of an experimental reactor are reported. The coordinates of each event are determined in this system. After processing in a LSI 11 23 computer, a radiograph, accumulated in a histogramming memory of 64 K 16-bit words, is presented on a colour display. A 230 × 180 mm 2 low-pressure multistep chamber is used as a detector. Neutron conversion takes place in a 6 μm boron layer enriched to 86% in 10B. The detection efficiency of thermal neutrons is no less than 3%. The count rate of the system reaches up to 2 × 10 5 events per second. A radiograph can be obtained within 10 minutes. The sensitivity of this system to gamma-background is low. One event/s is detected for a background of 1 R/h. The spatial resolution is found to be 0.7 mm (FWHM) using a cadmium knife edge. The integral nonlinearity is less than 0.4%. The possibility of using a hydrogeneous converter in this system for neutron radiography is discussed.