Abstract
By using a composite source system, we measured radiographs of the thermal neutron and keV X-ray in the 45-MeV electron linear accelerator facility at Hokkaido University. The source system provides the alternative beam of neutron and X-ray by switching the production target onto the electron beam axis. In the measurement to demonstrate a complementary imaging, the detector based on a vacuum-tube type neutron color image intensifier was applied to the both beams for dual-purpose. On the other hand, for reducing background in a neutron transmission spectrum, test measurements using a gadolinium-type neutron grid were performed with a cold neutron source at Hokkaido University. In addition, the simulations of the neutron and X-ray transmissions for various substances were performed using the PHITS code. A data analysis procedure for estimating the substance of sample was investigated through the simulations.
Highlights
A complementary imaging using a difference between the penetration abilities of neutron and X-ray is expected to enhance information which is obtained from an individual X-ray or neutron image such as materials and structures of an object
In a measurement for the complementary imaging, a detector based on a vacuum-tube type neutron color image intensifier (NCII; TOSHIBA, UltimageTM-nγ -04) [5] has been applied to the both neutron and X-ray beams
Test measurements for supressing the background using a gadolinium-type neutron grid were performed on the beam line of cold neutron source at Hokkaido University [9]
Summary
A complementary imaging using a difference between the penetration abilities of neutron and X-ray is expected to enhance information which is obtained from an individual X-ray or neutron image such as materials and structures of an object. We had installed a composite source system of thermal neutron and keV X-ray in the 45-MeV electron linear accelerator facility at Hokkaido University [1, 2]. The source system is an accelerator-driven and provides the alternative beam of neutron and X-ray by switching the production target onto the electron beam axis. We have developed the measurement method of the images for the both beams by using a two-dimensional neutron detector [3]. In order to demonstrate the good point of a combination of the composite source system and the dual-use detector, transmission images for a sample were measured using the neutron and X-ray beams. The recent measurements and simulations for the complementary imaging with the neutron and X-ray beams are reported
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