Would one atom of antimatter be lethal if annihilated inside the brain?

I am dealing with a dystopian story that tries to come up with some kind of total surveillence or control from higher authorities.

The authorities threaten to kill those who disobey them by simply freeing an antimatter atom from its containment which is placed inside your brain. Let's handwave everything away like how the containment would look like, how big it is, how it got inside the brain or how it could be switched off etc.

Would one atom of antimatter (say anti-hydrogen for simplicity) be instantly lethal if it annihilated inside your brain? If not, how many atoms would be required? Would it also work in other parts of the body?

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Would one atom of antimatter be lethal if annihilated inside the brain?

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