# 17th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2021)

26 August 2021 to 3 September 2021

### Support

30 Aug 2021, 18:00
1h 30m
Poster Dark Matter and its detection

### Speaker

Hiroshi Ito (Tokyo University of Tokyo)

### Description

We have been developing an alpha-ray detector based on a time-projection-chamber in a low radioactivity background, in order to image the radioisotope concentration on the material surface. In underground particle physics, current detectors are required massive volume of target using ultra-pure material without radioactive impurities. However, uranium or thorium impurities on the surface of the detector could be reduced fiducial volume and produced background source via emanation radon. In last conference, we provided the alpha-ray imaging detector with a sensitivity of a few $10^{-3}$ $\alpha$/cm$^2$/hr in 10cm $\times$ 10cm of effective sample area. In this work, we performed to improve the sensitivity, and we would present a current status of the upgrading alpha-ray imaging detector.

### Primary authors

Hiroshi Ito (Tokyo University of Tokyo) Mr. Ishiura Hirohisa (Kobe University) Dr. Kiseki Nakamura (Tohoku University) Prof. Miuchi Kentaro (Kobe University)

### Presentation Materials

###### Your browser is out of date!

Update your browser to view this website correctly. Update my browser now

×