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Tree-Ring Strontium-90 and Cesium-137 as Potential Indicators of Radioactive Pollution

^a Wood Anatomy and Quality Lab., Forestry and Forest Products Res. Inst., Tsukuba Norin P.O. Box 16, Ibaraki 305-8687, Japan
^b Radioisotope Res. Center, Kyoto Univ., Sakyo, Kyoto 606-8502, Japan
^c Grad. School of Agriculture, Kyoto Univ., Sakyo, Kyoto 606-8502, Japan
^d Div. of Human Environment, The Univ. of Human Environments, Okazaki, Aichi 444-3505, Japan

View larger version (33K): [in a new window]   Fig. 1. A map showing study sites. A Japanese cedar was sampled at A, 16 km away from the hypocenter; a Japanese persimmon was sampled at B, 11 km away from the hypocenter; and C is the hypocenter of the atomic bomb detonation. Dotted area shows where the "black rain" fell.

View larger version (20K): [in a new window]   Fig. 2. Radial distributions of 137Cs in Japanese cedar trees. Results of Hiroshima Japanese cedar are shown with error bar of ±1 standard deviation and a data point shown as b.d.l. means that the measurement was below the detection limit. Data are not corrected for radioactive decay.

View larger version (41K): [in a new window]   Fig. 3. Radial distribution of alkali and alkali earth metals, where concentrations are shown on a dry wood basis and vertical lines in the figure show sapwood–heartwood boundaries. The Cs of Kyoto Japanese persimmon is shown with error bars of ±1 standard deviation. Concentration of Ca was analyzed by two methods. ICP represents the data by inductively coupled plasma mass spectrometry analysis and INAA by instrumental neutron activation analysis. Although Mg is not an alkali earth metal, it is included in the figure.

View larger version (19K): [in a new window]   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.

View larger version (22K): [in a new window]   Fig. 5. Variation of 90Sr/Sr profiles among the species and the sites in Japan; the data are not corrected for radioactive decay.

View larger version (18K): [in a new window]   Fig. 6. The relationship between tree-ring 90Sr specific activity and soil 90Sr activity. Correlation coefficient was significant at the 1% level.