Figure 4
Temporal variations in 137Cs concentration ratio of heartwood/sapwood. Circles show the observed values, and crosses are the calculated values using the detection limits. The true states were estimated using a dynamic linear model, and the median values and 95% credible intervals are shown by solid lines and shaded regions, respectively. Horizontal lines indicate significant differences between the estimated true state values in the years at the both ends (delimiting years). Data from 2011 to 2016 were provided in previous studies8,25.
