Figure 3
From: Rain-induced bioecological resuspension of radiocaesium in a polluted forest in Japan
Relationship between the coloured fungal particle number concentration and 137Cs activity concentration in the air at the Namie site (inside the forest (F) and the bare ground (G)) during the warm season in 2016. Sampling data are expressed as mm/dd (e.g., m1/d1-m2/d2). Six of the present plotted data for the nonrainy period that had been published in Igarashi et al.13 were re-evaluated using the present spore counting method (see the text and Supplementary materials). The collection duration for nonrainy samples was 24 h in the daytime or nighttime (G:8/31–9/2, G:9/4–6 and G:9/24–26) of the dates shown next to each data point. For instance, daytime data of G:10/1–2 indicate that the sampling was performed from 6:00 to 18:00 on October 1 and October 2 for a total of 24 h. On the other hand, the collection duration for rainy samples encompassed several weeks due to the small percentage of the whole sampling period represented by rain. Here, regression curves were obtained by assuming that 137Cs was carried only by fungal spores; thus, the curves should pass the origin. Caesium-137 data and sampling details are summarized in Supplementary Table S2.
