Figure 1
From: Plutonium aided reconstruction of caesium atmospheric fallout in European topsoils
Atomic ratios of 240Pu to 239Pu measured in European topsoil samples (0–20 cm, n = 134). Error bars correspond to the standard deviation, which was calculated after conducting three sequential analyses of the same Pu extract solution from a single preparation of the sample. The analysed samples are normally distributed around the mean literature-derived global fallout ratio (dashed blue line = literature mean; blue ribbon = literature derived standard variation). For comparison, the literature-derived mean Chernobyl fallout atom ratio is displayed (dashed red line = literature mean; red ribbon = literature derived standard variation). Histograms at the top and right side represent the distribution of the samples.
