Preliminary study of neutron tomography performance tested by a standard specimen

Abstract

The performance of neutron tomography facility at the Thai Research Reactor TRR-1/M1 is studied. Thermal neutron beams with a flux of 106 n/cm2/s are employed to radiate on a standard sample, so-called Strip B, in the test. The neutron irradiating on samples were detected by a neutron-to-photon conversion plate. After that, the low-energy photons were guided to a charge coupled device (CCD) to obtain a digital image. During the experiment, a rotation stage was used to rotate the sample in order to measure the attenuated/scatted neutrons at different angles with respect to the sample geometry. The angle-varied images were then processed via a reconstruction software to create a 3-dimension (3D) image (tomography). The result shows that an image of 0.5 mm-diameter cadmium wire could be observed by employing our facility, but the sharpness of the 3D image is still needed to be further improved.

Determination of neutron image quality of compact collimator facility for non-destructive testing

“…The resolution is reduced for the slice located close to the top/bottom of the ball. Minimum resolution of the copper ball was 0.5 mm, consistent with the resolution of 3D-images obtained in a previous study [19]. However, this value was smaller than the resolution found for copper spheres in the vials.…”