Radioactivity from radon is a major background for observing solar neutrinos at Super-Kamiokande. In this paper, we describe the measurement of radon concentrations at Super-Kamiokande, the method of radon reduction, and the radon monitoring system. The measurement shows that the current low-energy event rate between 5.0 MeV and 6.5 MeV implies a radon concentration in the Super-Kamiokande water of less than 1.4 mBq/m3.
|Original language||English (US)|
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - 1999|
Bibliographical noteFunding Information:
The authors acknowledge the cooperation of the Kamioka Mining and Smelting Company. The Super-Kamiokande has been built and operated from funding by the Japanese Ministry of Education, Science, Sports and Culture, and the United States Department of Energy. This work was supported in part by Grant-in-Aid for Scientific Research (B) of the Japanese Ministry of Education, Science and Culture.