2011年5月7日土曜日

land surface contamination map

(i rewrote this page after 12 hours later from the first post because i found original source)

Japanese Ministry of Education, Culture, Sports, Science and Technology and the United States Department of Energy announced the land surface contamination map today. It is the first time the map is announced.
http://www.mext.go.jp/component/a_menu/other/detail/__icsFiles/afieldfile/2011/05/06/1305820_20110506.pdf

above pdf includes following 4 pictures.


Fig.1 Environmental radiation levels(μSv/h)

Fig.2 Cesium-134 and Cesium-137 on surface (Bq/m2)



Fig.3 Cesium-134  on surface (Bq/m2)

fig.4 Cesium-137  on surface (Bq/m2)


on Fig.4
Red : 3,000,000-14,700,000 Bq/m2
Yellow : 1,000,000-3,000,000 Bq/m2
Green : 600,000-1,000,000 Bq/m2
Pale blue : 300,000-600,000 Bq/m2
Blue : -300,000 Bq/m2

To compare elder brother Chernobyl map, I need to change the unit.

Red : 81-396.9 Ci/km2
Yellow : 27-81 Ci/km2
Green : 16.2-27 Ci/km2
Pale blue : 8.1-16.2 Ci/km2
Blue : less than 8.1 Ci/km2

Roughly speaking, degree of pollution of  red + yellow + green zone equal to "Confiscated/Closed Zone" and "Parmanent Contrl Zone" in Chernobyl


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