title: Variations of gamma-ray background in the Belgrade shallow underground low-level laboratory.
abstract: During the last three years we investigated the variations of background simultaneously in two laboratories, the ground level (GLL) and the underground laboratory. The Forbush-like effect from March 2010 was observed in the GLL using a Ge detector and plastic veto scintillator. The underground plastic scintillator saw the same effect but the coincident veto spectrum did not detect the decrease of cosmic-ray intensity. Using a time series analysis of prominent post-radon lines, a significant radon daily variability was detected in the Ge detector background spectrum, but only in the GLL.
authors.affiliation: Institute of Physics, University of Belgrade, Belgrade 11080, Serbia. Electronic address: banjanac@ipb.ac.rs.
authors.forename: Radomir
authors.initials: R
authors.lastname: Banjanac
authors.affiliation: Institute of Physics, University of Belgrade, Belgrade 11080, Serbia.
authors.forename: Aleksandar
authors.initials: A
authors.lastname: Dragić
authors.affiliation: Institute of Physics, University of Belgrade, Belgrade 11080, Serbia.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Udovičić
authors.affiliation: Institute of Physics, University of Belgrade, Belgrade 11080, Serbia.
authors.forename: Dejan
authors.initials: D
authors.lastname: Joković
authors.affiliation: Institute of Physics, University of Belgrade, Belgrade 11080, Serbia.
authors.forename: Dimitrije
authors.initials: D
authors.lastname: Maletić
authors.affiliation: Institute of Physics, University of Belgrade, Belgrade 11080, Serbia.
authors.forename: Nikola
authors.initials: N
authors.lastname: Veselinović
authors.affiliation: Institute of Physics, University of Belgrade, Belgrade 11080, Serbia.
authors.forename: Mihailo
authors.initials: M
authors.lastname: Savić
keywords: Cosmic rays; Radon variability; Underground low-level laboratory