After the Chernobyl nuclear accident, the Pripyat River inUkraine received 5.0 ×1011 Bq yr?1 of90Sr from around the Chernobyl nuclear plant throughrunoff water and groundwater seepage, totaling 1.0 × 107m3 yr?1 of the effluent discharge. ThePripyat River width under a normal (mean annual) flow condition is200 m. The nearest resident is living at the town of Chernobyl,which is 10 km downstream on the same (south) side of the river asthe nuclear plant. Determine the 90Sr concentration inthe river at the town of Chernobyl.
