They also needed an alternative to conventional X-rays. In a clinical linac, X-ray photons are produced by dumping high-energy electrons into a bremsstrahlung target, which is made of a material with a high atomic number, like tungsten or copper. The target slows the electrons, converting their kinetic energy into X-ray photons. It’s an inherently inefficient process that wastes most of the beam power as heat and makes it extremely difficult to reach the ultrahigh dose rates required for FLASH. High-energy electrons, by contrast, can be switched on and off within milliseconds. And because they have a charge and can be steered by magnets, electrons can be precisely guided to reach tumors deep within the body. (Researchers are also investigating protons and carbon ions; see the sidebar, “What’s the Best Particle for FLASH Therapy?”)
现场排队人群中，相当比例是毫无技术背景的普通群众，不仅有20-40岁的白领，更有推婴儿车的宝妈、小学生以及60多岁的退休工程师，受众跨度完全超出团队预期。。safew对此有专业解读
。谷歌是该领域的重要参考
Последние новости，这一点在今日热点中也有详细论述
Момент удара ракеты по спутниковой станции в Израиле попал на видео20:56