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more radiation, and other medical imaging has soared in recent years. The tests can be lifesaving, and specialists say people who really need one shouldn't avoid it for fear of future risk from radiation.
• ___

• MADISON, Wis. (AP) -- The candidates may be the same, but Wisconsin isn't.
• In the tumultuous 18 months since Republican Scott Walker defeated Democrat Tom Barrett in the 2010 governor's race, Wisconsin has been rocked with massive protests over workers' rights, recall elections over a contentious union rights law and a partisan divide that's strained families and friendships.
• Now, Walker and Barrett are headed for a rematch.

• Barrett, the mayor of Milwaukee since 2004, easily won the Democratic primary Tuesday and will take on Walker in the June 5 recall a short four weeks away. Walker defeated Barrett by 125,000 votes, or 5 percentage points, in 2010 as part of a GOP sweep into power that also saw them take the Legislature and knock off Democratic U.S. Sen. Russ Feingold.
• The recall drive was sparked when Walker and Republicans passed a law that effectively ended collective bargaining rights for most public workers and forced them

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