Fig. 4. Radial distribution of 90Sr/Sr in Hiroshima and Yamagata Japanese cedar. Because of 90Sr radioactive decay (half life 28.8 yr), 90Sr/Sr data were corrected for decay based on tree-ring age.
Fig. 4. Radial distribution of 90Sr/Sr in Hiroshima and Yamagata Japanese cedar. Because of 90Sr radioactive decay (half life 28.8 yr), 90Sr/Sr data were corrected for decay based on tree-ring age.