Accumulate Condition and Temporal Variation of Radioactive Caesium in Lawn Sites

This paper addresses the temporal variation of air dose rate and radioactive caesium activity at the lawn sites of baseball stadium located at the Chiba Prefectural Kashiwa-no-ha Park. Collected lawn samples were separated to vegetation part and soil part, and they were measured individually by gamm...

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Bibliographic Details
Published in:RADIOISOTOPES 2014/10/15, Vol.63(10), pp.481-488
Main Authors: INOUE, Tomohiro, ICHIKAWA, Yujiro, NAITO, Suekazu, TAKAHASHI, Yoshihiko
Format: Article
Language:English
Subjects:
Chiba Prefecture
decontamination
Fukushima Daiichi Nuclear Power Plant accident
lawn
radioactive caesium
thatch
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Summary:This paper addresses the temporal variation of air dose rate and radioactive caesium activity at the lawn sites of baseball stadium located at the Chiba Prefectural Kashiwa-no-ha Park. Collected lawn samples were separated to vegetation part and soil part, and they were measured individually by gamma spectrometry using a germanium detector to determine the radioactive caesium activity. According to the results obtained, the thatch layer(surface layer of lawn with dense accumulation of death and living vegetation) showed higher activity of radioactive caesium compared to the soil lying underneath the thatch layer throughout the study period. We measured 70% of air dose reduction rate(the natural radiation derived from the ground was subtracted for calculation) at the height of 50cm above the ground when the lawn was uniformly mowed at the depth of 20mm, that is to say, removing the thatch layer is an effective decontamination method.
ISSN:0033-8303
1884-4111
DOI:10.3769/radioisotopes.63.481