Protons can penetrate up to 30 centimeters, reaching deep-seated tumors. But the delivery of protons in a continuous beam limits the dose rates. Also, proton systems are far larger and more expensive than, say, X-ray machines, which will likely constrain their availability to specialized centers.
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President Donald Trump promised that 2026 would be a bumper year for economic growth, but instead it has kicked off with job losses, rising gasoline prices and more uncertainty about America’s future.。新收录的资料对此有专业解读
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