Traces of short- and long-lived fallout isotopes ( 131 I, 134 Cs and 137 Cs) were found in environmental samples obtained in northwest Germany (river sediment, rainwater, grass and milk) from March to May 2011, following the radioactivity releases after the nuclear accident in Fukushima, Japan. The found concentration values are consistent with reported concentrations in air, amount of rainfall and expected values applying simple radioecological models. The [ 134 Cs]/[ 137 Cs] ratio reported for air (about 1:1) allows for discrimination between “recent” and “old” 137 Cs. Expected 136 Cs values fell below the detection limits of the instrumentation, despite large sample masses and long counting times.