Seeking Help to Test Far-UVC Device

I'm being given a personal FAR-UVC device of 10 watts, and I want to test its efficacy on sars-cov-2.

My background is in QA, and also now patient advocacy. I am disabled and I'm part of a larger disabled community, and we are trying to figure out how to protect ourselves during medical appointments in unmasked facilities.

I've purchased some dosimeter cards from Intellego, but I'm having trouble figuring out exactly how to use them to figure out time / efficacy of disinfection.

One card changes color at 3, 6, 10, 20, and 30 mj/cm2. But I'm still seeing conflicting info in the research about exactly what intensity works to reduce sars-cov-2. Also there is a duration issue. The card shows when I've reached that amount of exposure but not the other question of duration (like 30 seconds at 3 mj/cm2).

I do not have $3,000 for a digital dosimeter.

Suggestions welcome!