No.5（2010）1.Study of high-resolution radiography by x-ray with refractive lends

Daigo Kawahara, Shigeru Takada

  The x-ray compound refractive lends (CRL) are lends with array of concave wall, and suited for high resolution imaging with hard x-ray. However, there are plobrems to apply CRLs to nondestructive test with hard x-ray; cause of low refractive index of hard x-ray, and radiating x-ray to out of focus. In this study, we produced CRLs experimentally with polystayrene or aluminum round bars, have array of holes. We measure dose rate of hard x-ray passing through CRL, and take images by their x-ray with imaging-plate (IP) at some distances from end of CRLs. As a result, transit dose rate of hard x-ray passing through CRLs was lower than dose rate used general radiographic testing. Then, aspect ratio of images taken with hard x-ray passing through CRLs were increasing with distance from edge of CRL. We confirmed that hard prototype of CRLs refracted hard x-ray with 400kV of tube voltage. However we must develop the CRL to advanced stage, with design of lends parameters; curvature factor, gap of concave faces, and optimal rate between lends materials to shorten focul distance and to decreace radiating x-ray.

Keywords

ondestructivetest, X-ray, Compound refractive lens, High resolution imaging, Radiography

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