Figure 3 : The isogram map shows average active cesium (quasi-Cs137) contamination level of the Ayu (Plecoglossus) captured in between May and September 2011 on each prefectures in eastern Japan.

From: Overview of active cesium contamination of freshwater fish in Fukushima and Eastern Japan

Figure 3

Each isogram center points are each prefecture's capital city. We created the map using the GIS software which is 'MANDARA for windows 2000/XP/VISTA/7 Version 9.35' (the software copyright: 1992–2011 Tani Kenji).