| tree-ring strontium-90 and cesium-137 as potential indicators of radioactive pollution. | to examine whether tree rings can be used to detect or assess local historical 90sr or 137cs fallout, such as that resulting from the hiroshima atomic bomb, radial distribution of 90sr and 137cs in trees was examined. we studied a gymnosperm [japanese cedar, cryptomeria japonica (l. f.) d. don] and an angiosperm (japanese persimmon, diospyros kaki thunb.) tree species from the vicinity of the atomic bomb hypocenter, and from other locations in japan. a significant amount of 137cs was detected in ... | 2002 | 12469850 |