You can see tritium sights through passive night vision equipment. I don't think you need to worry about being tracked by the radiation they emit though. Tritium is used in watches, compasses and many other applications besides gunsights.
I'd worry more about being tracked with your cell phone or other electronic emission you might have (family radio, cb etc.). Even thermal imagery can be spoofed. Remember that for every measure there is a countermeasure.
Jeff
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