Abstract
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.
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