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Russia is working on something similar.
https://www.ibtimes.com/russias-radiation-gun-turns-people-zombies-putin-434352
Even White supremacists have been working on it.
https://www.splcenter.org/hatewatch/2015/08/24/klansman-convicted-trying-build-%E2%80%98radiation-gun%E2%80%99-kill-muslims