quote .............."where I try to collect old Irish glass" ...... ah, now this sounds more like my cup of tea - look forward to seeing some pieces

I would agree with the suggestion of second half C19 (perhaps the latter half)..........although I think some of the problem is that much Georgian glass was copied, giving perhaps the false impression that anything in that style must be old. I'm sure these things were made into the C20.
The individual elements of your glass are found in Georgian/Regency designs..........the lipped round funnel bowl, flat cut flutes, the bladed knop and the collar/merese (under the bowl), were around half a century or more earlier - but I'd suggest their proportions and combination in your piece are wrong for the period. Also maybe the foot is a tad small for Georgian. You probably have a small depression, centrally under the foot, where the pontil scar was removed. Uranium produces it's very own types of green, lighter in general than the Georgians deeper bluey-greens, and well known bristol green. It's true that some poeple here can see uranium green from very long distances.

Rather than a Geiger counter, why not get a small u.v. torch - the small key-ring sort are inexpensive. Nice glass by the way, but now you've seen one, you'll find them everywhere - green, whether uranium or not is possibly most common form of coloured drinking glass even if only used for the bowl.