Yes, completely safe, due to heavy shielding of pre-firing chambers. Although weapons operate on different principles, typical radiation levels are almost equal: 0.8μSv/h and 0.6μSv/h, respectively. Not only special relativity, but quantum mechanics – or more precise quantum field theory – is involved in their design. For complete understanding of MegaOrgasmer 5000, you need to employ AdS/CFT, too. I intended to throw some equations, but Hotline text editor doesn’t support TeX inputs.