Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 615, Issue -, Pages 187-196Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2017.09.212
Keywords
Portable germanium gamma ray detector; Cs-137; Horizontal variability; Japanese cedar; Mixed broad-leaved forest; Canopy cover
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Funding
- Japan Society for the Promotion of Science [15H00969, 16K16201]
- Grants-in-Aid for Scientific Research [16K16201, 15H00969, 16H01791] Funding Source: KAKEN
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Spatial patterns of atmospherically deposited radiocesium on the forest floor and the temporal evolution were measured in two Japanese cedar stands and a secondary mixed broad-leaved forest in the early phase of the Fukushima Daiichi Nuclear Power Plant accident. In situ measurements of the Cs-137 gamma count were made using a portable germanium gamma ray detector. These measurements revealed that the forest floors were contaminated with radionuclides derived from the accident. In the cedar stands, the inter-canopy area had higher Cs-137 count rate relative to the under-canopy area, whereas no clear relationship was found between the radiocesium pattern and canopy cover in the mixed broad-leaved forest. Repeated radiocesium measurements revealed that the spatial pattern of radiocesium activity on the forest floor did not substantially change following additional deposition inputs. Furthermore, the magnitude of canopy cover partially explained spatial variability of the Cs-137 on the forest floor in cedar stands. These results suggest that canopy structure affected the genesis of the horizontal variability of atmospherically deposited radiocesium on the forest floor during the early phase of the Fukushima accident. (C) 2017 Elsevier B.V. All rights reserved.
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