– [Nightmare] 900,000,000 Bq/m3 of all β detected from groundwater on the east side of reactor2 (Fukushima Diary, July 5, 2013):
Having measured the significantly high level of Tritium from groundwater on the east side of reactor2, Tepco made additonal borings and is investigating furthermore.
On 7/3/2013, Fukushima Diary reported they detected 4,300,000 Bq/m3 of all β at 6m from the sea.
(cf, All β nuclide level increased to be 4,300,000 Bq/m3 at 6m from the sea, “1.4 times much as 3 days ago” [URL])
On 7/5/2013, they measured 900,000,000 Bq/m3 of all β from the groundwater. The sample was collected from another boring next to the one where they detected 4,300,000 Bq/m3.
All β nuclides contain Strontium-90 but the specific readins is not announced. This is the worst reading of groundwater contamination that Tepco has ever published.