A REAL CASE
Documented Lake Karachay: The Small Russian Lake That Became the Most Polluted Place on Earth
In 1990, the radiation was measured at one spot on the shore of a small lake in Russia. The spot was next to the outlet where liquid waste flowed into the water.
The reading was about 600 roentgen per hour. In modern units, that is about 6 sieverts every hour.
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