Abstract
The Large Volume Detector (LVD), located in the hall A of the INFN Gran Sasso National Laboratory, is a ν observatory mainly designed to study low energy neutrinos from the gravitational collapse of galactic objects. The experiment, which is continuosuly taking data and consists of 840 scintillator counters, can monitor the local radioactivity background at energies < 0.5 MeV.In this paper we study the long-term behavior of this low-energy counting rate since 1997. The Fourier analysis of the period 1997-2002 shows the existence of a seasonal modulation with the maximum occurring at the end of August. The same modulation is found by analyzing data collected by a Radon-meter placed inside the detector: this shows that changes in the concentration of Radon in the experimental hall are responsible for the measured variations of the counting rate in LVD.
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