Water Updates as of April 20, 2011

Readings at Lake Kasumigaura (water source for Tsukuba)

March 29 at Tsuchiura City
14.9 Bq/kg for iodine
1.06 Bq/kg for cesium
March 30 at Sakuragawa City
11.6 Bq/kg for iodine
1.01 Bq/kg for cesium
March 31 at Tsuchiura City
13.4 Bq/kg for iodine
1.05 Bq/kg for cesium
April 1 at Sakuragawa City
9.2 Bq/kg for iodine
1.96 Bq/kg for cesium
April 2 at Tsuchiura City
11.2 Bq/kg for iodine
cesium not detected
April 4 at Tsuchiura City
10.1 Bq/kg for iodine
0.90 Bq/kg for cesium
April 5 at Sakuragawa City
6.2 Bq/kg for iodine
cesium not detected
April 6 at Tsuchiura City
7.1 Bq/kg for iodine
cesium not detected
April 7 at Sakuragawa City
5.5 Bq/kg for iodine
0.72 Bq/kg for cesium
April 8 at Tsuchiura City
6.0 Bq/kg for iodine
cesium not detected
April 9 at Sakuragawa City
not tested
April 10 at Tsuchiura City
6.2 Bq/kg for iodine
cesium not detected
April 11 at Sakuragawa City
4.0 Bq/kg for iodine
cesium not detected
April 12 at Tsuchiura City
3.7 Bq/kg for iodine
cesium not detected
April 13 at Sakuragawa City
4.0 Bq/kg for iodine
cesium not detected
April 14 at Tsuchiura City
4.8 Bq/kg for iodine
cesium not detected
April 15 at Sakuragawa City
3.8 Bq/kg for iodine
cesium not detected
April 18 at Tsuchiura City
3.4 Bq/kg for iodine
cesium not detected
April 19 at Sakuragawa City
2.4 Bq/kg for iodine
cesium not detected
April 20 at Tsuchiura City
2.1 Bq/kg for iodine
cesium not detected

Source: http://www.pref.ibaraki.jp/20110311eq/pdf/0403.pdf (Ibaraki prefectural government)


Levels at which we need to start getting concerned
iodine: 300 Bq/kg for drinking water (adults) and 100 Bq/kg for drinking water (babies)
cesium: 200 Bq/kg for drinking water

Verdict: Safe to drink the water in Tsukuba

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