Measurement of radon concentrations at Super-Kamiokande
Super-Kamiokade Collaboration: Y.Takeuchi et al
TL;DR
This paper reports on the measurement and reduction of radon levels in Super-Kamiokande, demonstrating that radon concentrations are sufficiently low to minimize background noise in solar neutrino detection.
Contribution
It introduces a method for measuring and reducing radon in Super-Kamiokande, providing a monitoring system to ensure low background levels for neutrino observations.
Findings
Radon concentration in water is less than 1.4 mBq/m$^3$
Low-energy event rate indicates effective radon suppression
Monitoring system successfully tracks radon levels over time
Abstract
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/m.
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