Hiroyuki Hasemi

Spatial resolution enhancement of neutron radiogram by cooperating with X-ray radiography

Using pulsed neutron imaging, the distributions of absolute values of nuclide densities and temperatures of the sample can be estimated. However, the images obtained by the pulsed neutron imaging have a low spatial resolution because of the performance limitations of the detector. On the other hand, X-ray radiograms have higher spatial resolution compared with the neutron images. To obtain higher-resolution neutron images, we developed the resolution enhancement method for neutron images by cooperating with the X-ray radiography. The resolution enhancement method consists of the image alignment and the mapping methods. As a first step, we tried mapping neutron transmission image into the X-ray image.

Neutron counting type imaging detector with super-resolution technique

A combination of a neutron image intensifier and a photomultiplier tube array was developed as a neutron imaging device for time-of-flight measurement. The device had an advantage in the neutron counting measurement because of the proportionality to the neutron intensity. A problem was in poor spatial resolution by the photomultiplier tube array, so the super-resolution ability based on the center-of-mass calculation was attached to the newly developed data taking system. We confirmed its ability of time-of-flight measurement through the trial experiment. The super-resolution system also operated without failure.