The geographical distribution of the dose rate recorded by D3 (μGy h⁻¹). Upper panel – measurements inside the phantom for the time intervals 27 December 2011 to 20 May 2012 and 12 September 2012 to 09 March 2013. Bottom panel – measurements outside the phantom in the period 21 May 2012 to 11 September 2012. On the X-axis is the longitude, on the Y-axis is the latitude, the dose rate intensity is color coded, the small white quadrates indicate the lack of measurements.