After the Chernobyl meltdown in Ukraine in 1986, some 2,000 km 2 of Belarus was covered in cesium-137 with an activity of about 1500 Bq/m2. Cesium-137 decays with a half life of about 30.17 years into Barium-137, which is stable. In 2006, when local physicists collected samples of soil in this part of Belarus to test for radiactivity, what activity of cesium-137 would they measure?
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