ベリリウム-7の樹種別捕捉特性 [in Japanese] Capturing Characteristics of Beryllium-7 in Selected Tree Species [in Japanese]
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With regard to <sup>7</sup>Be, a natural radioactive nuclide, the botanical capturing characteristics were compared between eight species of those trees which grow in a local district. The mechanism of such botanical capture by their leaves was discussed. The amounts of captured <sup>7</sup>Be were different by tree species. Higher radioactivities were found in the coniferous trees than in the broadleaf trees. The seasonal change of <sup>7</sup>Be radioactivity in leaves was significantly higher in winter and spring and lower in summer. Since airborne or fallout <sup>7</sup>Be particles stay on the upper face of leaves, the depositted amount depended on the surface area per weight of leaves particularly for evergreen trees. Because the <sup>7</sup>Be amount in leaves depended on the fallout capturing ability of leaf's superficial skin as well as the cleaning effect of rain and the like, the radioactivity on the surface can change depending on the surface condition of leaves even in the case the levels of <sup>7</sup>Be fallout stayed the same.
- Jpn. J. Health Phys.
Jpn. J. Health Phys. 32(1), 25-31, 1997-03-31
Japan Health Physics Society