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.
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Combinator reduction
第二百七十二条 船舶发生海上保险事故后，认为实际全损已经不可避免，或者为避免发生实际全损所需支付的费用超过保险价值的，为推定全损。