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?”)
ВСУ запустили «Фламинго» вглубь России. В Москве заявили, что это британские ракеты с украинскими шильдиками16:45
。业内人士推荐新收录的资料作为进阶阅读
但伊斯梅尔做了一个惊天动地的“豪赌”：他强制命令全境改宗，必须信奉伊斯兰教的什叶派 (Shia Islam)。
Given some data, and some operation, then we get a new piece of data
The depositions in the Clintons’ hometown of Chappaqua, a typically quiet hamlet north of New York City, come after months of tense back-and-forth between the former high-powered Democratic couple and the Republican-controlled House Oversight Committee as it investigates Epstein, who killed himself in a New York jail cell in 2019 while awaiting trial. It will be the first time that a former president has been forced to testify before Congress.