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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?”)，这一点在新收录的资料中也有详细论述
，详情可参考新收录的资料
https://joev.dev/posts/unprivileged-process-injection-techniques-in-linux
Alexandr Wang：很快。7个月前我加入Meta时，我们的全部重点都在于：先把这个组织以正确的方式搭建起来，为长期打好基础。我们的目标不是为了抄近路，不是为了某个短期结果做优化、却透支长期机会，而是要把科学基础打对，把人才密度拉高，把长期主义的重心立住，去除那些人为设定的死线，这样我们才能用最好的节奏去打造技术。。关于这个话题，新收录的资料提供了深入分析