Furthermore, assuming it becomes feasible to develop multiple neutrino beam machines, you could use a technique similar to "Gamma Knife" to reduce the radiation

Furthermore, assuming it becomes feasible to develop multiple neutrino beam machines, you could use a technique similar to "Gamma Knife" to reduce the radiation exposure along the beam paths (and to make it harder to detect/track) [0]. [0] https://en.wikipedia.org/wiki/Radiosurgery#Gamma_Knife https://en.wikipedia.org/wiki/Radiosurgery#Gamma_Knife