Abstract
A field study was carried out to determine the spatial distribution of air dose rate on grazed grassland after the earthquake on 11 March, 2011 in the Northwest Pacific of Northeastern Japan. Data on air dose rates (µSv h-1) were collected from Ichinoseki, south of Iwate Prefecture, Japan. Air dose rates were collected from each of 1 m interval of 12 ×12 m2 site (L-site). At the center of Lsite, 1.2 ×1.2 m2 site (S-site) was located. One hundred and forty four (144) equal spaced quadrats were defined in the S-site. Again, air dose rates were collected from central point of each of the quadrat. Moran’s I, a measure of autocorrelation was used to test the spatial heterogeneity of air dose rate on grazed grassland. Autocorrelation in S-site area was significantly higher than L-site area. Air dose rate did not show significant autocorrelation at any spatial lag in L-site. In S-site, air dose rate level showed significant autocorrelation in twelve of sixteen spatial lag. Autocorrelograms and Moran’s scatterplot showed that air dose rate was frequently and positively spatially correlated at distance less than 0.1 m.
Highlights
On 11 March, 2011, a catastrophic earthquake and Tsunami occurred in the Northwest Pacific of Northeastern Japan
The results described that clustering was strongest at shortest distance lag
The results described that at shortest distance air dose rate showed strong clustering tendency
Summary
On 11 March, 2011, a catastrophic earthquake and Tsunami occurred in the Northwest Pacific of Northeastern Japan. The earthquake and Tsunami caused destruction in the Northeastern Japan and severely damaged the Fukushima Daiichi Nuclear Power Plant (NPP) (Yasunari et al 2011). Air parcel carried these radioactive elements and accumulate these elements on the ground by subsequent wet and dry depositions. Among these materials, radioactive 137Cs and 134Cs causes deleterious effect on agriculture and farming and human life. Radioactive 137Cs and 134Cs causes deleterious effect on agriculture and farming and human life It causes the largest concerns in Japan
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