Electrons—long used to treat surface tumors and to generate X-rays—are light, nimble particles, far easier to control than protons or carbon ions. At low energies, they stop quickly in tissue, but new high-energy systems can drive electrons deeper. Now researchers are working on machines that combine multiple high-energy beams at different angles to let doctors sculpt radiation doses that match the tumor’s shape.
In Israel, 12 people have been killed by Iranian missile fire and more have been injured, including three on Sunday. At least 13 U.S. military members have been killed, six in a plane crash in Iraq last week.
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Москвичам рассказали о погоде во второй половине марта08:44
改造后的长沙市雨花区湘农桥社区二区9栋。