A gieger counter would eventually be destroyed as well. Like enough radiation long enough would destroy lead even.
The difference is in the fragility of circuitry and signals.
Like the rover for instance, that they used to try to clear the roof. It had circuit boards, with dozens of tiny components working in concer, and signal wiring, which needs precise consistent electricity to work.
Well radiation destroys those tiny components, and interupts the signals. The rover was pretty vulnurable to the task at hand.
Geiger counters on the other hand are very simple devices, with no circuitry, and no need to communicate signals. So even though they would eventually be destroyed by radiation, they aren’t as fragile to radation as more complicated devices.
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