Japan After 311 by Pradyumna P. Karan Unryu Suganuma & Unryu Suganuma

Author:Pradyumna P. Karan,Unryu Suganuma & Unryu Suganuma
Language: eng
Format: epub
Publisher: University Press of Kentucky
Published: 2016-03-16T16:00:00+00:00

Figure 11.8. Radioactive Cesium in Wheat.

Areal Distribution of the Radioactive Pollution in Forestry Products

Log-Planted Shiitake Mushrooms

The radioactive material spread not only to the cultivated lands, but also to the forests, which can pollute the forestry products. For an example of forestry products, the case of log-planted shiitake is shown here. Log-planted shiitake are grown widely in villages in the Abukuma mountains. There are two types of growing for the log-planted shiitake: outdoor type and greenhouse type. Needless to say, the outdoor type is much more likely to bear the pollution, but the monitoring data do not differentiate between the two types.

Figure 11.9 shows that extremely high pollution density was detected in the March to April period in the northeastern part of the prefecture, reaching 13,000 Bq/kg in Iitate Village. In addition, values over 1,000 Bq/kg appeared in another four municipalities near Iitate.

In the period of May to June, such tendency continued. The highest value was 2,700 Bq/kg in Soma City, located in the northeastern part of the prefecture. Samples with higher pollution than was found the previous period appeared in three municipalities. In the next period, July to August, pollution levels fell widely, with only one municipality (Date City) having a sample over 1,000 Bq/kg. This is thought to have been the result of a shipment of shiitake mushrooms from a more highly polluted area being stopped there.

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