I searched it up but it’s not very specific about how this works.
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Gamma rays can cause cancer because they damage cells, and *sometimes* when you damage a cell you mess up it’s DNA just right and bonk the wrong gene it turns the cell cancerous.
A “gamma knife” is a radiotherapy tool, it uses beams of radiation to murder cells in the target area. It uses more energy so it doesn’t just “damage” cells, it kills them.
By carefully targeting multiple beams from multiple directions they overlap on exactly the spot they want to remove. some cells in the path of the beam are still receiving a dangerous amount of gamma rays but that’s one of the tradeoffs for microwaving a tumour without cutting open the patient
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