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?”)
国家发展改革委有关负责人表示，将认真组织实施好要素市场化配置综合改革试点工作，聚焦要素价格市场化形成、畅通要素流通渠道等重点领域和关键环节，分类施策推进改革，围绕提升要素配置效率、培育发展新质生产力等目标，开展差异化改革探索，加快形成全国可复制可推广的路径模式。
。新收录的资料是该领域的重要参考
a 30-second profile with 10 players. Not great!
Игнатов заявил, что она должна быть привлечена к ответственности как минимум за недонесение информации и укрывательство похищенной девочки. Он подчеркнул, что после пропажи ребенка по Смоленску были повсюду расклеены ориентировки, поэтому сожительница похитителя не могла их не видеть.
“轻重”之策可以“御天下”。古代国家之间的经济竞争激烈，“轻重”理论主张当政者应奖励优待外来商人，通过内外政令吸引其他国家的财货、资金和人民为我所用，同时守住本国的关键物资不外流，并运用货币和价格工具引导他国形成对本国的依附性经济结构，最终赢得“天下轻我重”的优势地位。