At work, we use a Fluke 451-RYR survey meter to check for radiation after performing high dose rate brachytherapy with Iridium 192. While checking the source, the survey meter was left on in the actual treatment room (thereby receiving dose from the Iridium). Does that damage the survey meter? I'm not sure how it works. Just wondering if that interferes with it's calibration or... anything of that nature.

You can call the manufacturer to verify if its calibration is affected and needs to be recalibrated if you have accuracy, or efficiency, or accuracy issues.

No, it shouldn't. You should have a calibration source, check the meter with that.