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4. Consider the following graph which shows the radioactivity due to strontium-90, or 90Sr, in the Ukraine countryside near the Chernobyl nuclear reactor after the
4. Consider the following graph which shows the radioactivity due to strontium-90, or 90Sr, in the Ukraine countryside near the Chernobyl nuclear reactor after the reactor burned and exploded on 26 April 1986. a. Determine the half-life of 90Sr. Show your work or explain your logic. b. Approximately how intense is the radiation from 90Sr near Chernobyl now, compared to immediately after the disaster
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