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My friend's pre-fall family heirloom kept beeping faster, but still, we found nothing.
(self.twosentencehorror)
Two Sentence Horrors.
The title should be the first sentence, while the body should be the second.
Keep it spooky.
It means neither. It's a commonly used term when roleplaying post-apocalyptic scenarios to denote "before the apocalypse". So OPs scenario is survivors of an apocalypse lead to believe a Geiger Counter is a gold detector.
Edit: to clarify, the "fall" it's referring to is the fall of civilization