A second point was the finding that textures can be written with much lower beam intensity using tightly focused electron pulses. (sciencedaily.com)
The maximum beam intensity in the focus was found to be 1.9 × 1012 photons per µm2 per pulse. (bioxfel.org)
The technology to produce this high beam intensity, and in particular to handle the radioactive products safely and reliably, is now available, and many facilities are in their design or construction phases around the world. (newscientist.com)