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7204021 
Journal Article 
Fine structure of the absorbed dose rate monitored in Zagreb, Croatia, in the period 1985-2011 
Babic, D; Sencar, J; Petrinec, B; Marovic, G; Bituh, T; Skoko, B; , 
2013 
Yes 
Journal of Environmental Radioactivity
ISSN: 0265-931X
EISSN: 1879-1700 
ELSEVIER SCI LTD 
OXFORD 
118 
75-79 
23257217 
WOS:000315839000009 
We report on the fine structure of the absorbed dose rate D which was measured and recorded on a daily basis at the Institute for Medical Research and Occupational Health in Zagreb, Croatia, throughout the period 1985-2011. After the Chernobyl accident, D increased steeply by a factor of 3.5, but this is the only prominent feature in the D versus time (t) curve. In the absence of accidental conditions, the D(t) is flat and amounts to 30-35 pGy/s. Despite the apparent plainness of D(t), its Fourier transform reveals several periodic modulations hidden in the noise. Some of the corresponding periods (6 and 12 months) can be related to seasonal atmospheric changes but this is not the case with the other periods identified (9.3, 13.7, 15.7, 20, 31, and 39 months). These are found to agree well with literature data on periodicities in solar activity, which implies that they are most probably linked to variations in the atmospheric production of Be-7 by cosmic rays. (c) 2012 Elsevier Ltd. All rights reserved.