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Direction sensitivity could provide robust evidence for the direct detectionof weakly interacting massive particles constituting dark matter. However, thesensitivity of this method remains low due to the radioactive backgrounds. Thepurpose of this study is to develop a low-background detector as atwo-dimensional imaging device for a gaseous time projection chamber. Indirection-sensitive dark matter experiments~(e.g. NEWAGE), $\alpha$-raysemitted from the detector components often create substantial radioactivebackgrounds. Based on the study of the background of NEWAGE, a new detector"low-$\alpha$ $\mu$-PIC" is developed. The produced $\mu$-PIC performs well asa gas detector and the $\alpha$-ray emission rate from the $\mu$-PIC reduced bya factor of 100.

Development of a low-$\alpha$-emitting $\mu$-PIC as a readout device for direction-sensitive dark matter detectors