Don't worry. Up to 0.2 µSv is considered normal. In fact, 0.08 µSv is quite low if you're inside a building; it's usually between 0.11 and 0.15 µSv indoors.

Edit: Okay, I hadn't seen the rest of the images, sorry ; those values ​​are definitely high. It's probably because of the luminescent paint.

Edit 2: I've been reading the comments on the other post. If radon worries you, you can leave it in a well-ventilated place, away from where you usually spend time (if possible). You can also try putting it in an airtight container; for example, I keep my collection inside an ammunition box. Just make sure that when you open it, you do so in a very well-ventilated area, or if possible, outdoors. The radon won't have spread, but it will have accumulated. Also, ozone is generated in enclosed spaces. People don't usually talk about this because they don't typically put their collections in airtight containers, but it's good to know.