Tepco released the sea contamination map thought it is not trustworthy at all.
However, it shows they measured Strontium 89 from about 60 km away to south in the ocean.
Strontium 89: 0.033 Bq/L
Strontium 90: 0.085 Bq/L
(Outer layer of the sea)
The half life time of Strontium 89 is 50.52 days.
According to the “data”, they were not supposed to measure cesium for some reason but the measurement of strontium 89 proves the contaminated water still keeps leaking.