Abstract
Precise measurements of radioactive impurity concentration in the detector materials have been established for various underground particle physics experiments. It is also important to measure the surface radioactive contamination on these materials because their decay products would potentially reduce the fiducial volume of the detector and would also produce background sources via radon emanation. In this study, descriptions on an α-ray imaging chamber based on a gaseous micro-time-projection chamber are reported. A detector upgrade to improve the sensitivity by a suppression of the background rate and a demonstration of alpha-ray imagings are also described.
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