I am not nearly as knowledgeable on the subject as most are here, so I do apologize for that upfront.

I have a radiacode 10, which measures inside of my bathroom and bedroom around 53.4nSv/h up to 58nSv/h.

I just happened to read the first number I listed before I got into the shower. I take decently hot showers, more than enough to steam the room up by accident.

I got out and went to pat it dry just in case, but before I started to I noticed it dropped down to about 36.4nSv/h. It has NEVER read that low in my house before.

I begun to wonder: could increased water molecules in the air act as a sort of temporary "barrier/medium" for ionizing radiation to to influence before it reaches my scintillator? As the steam cleared it has since started to read normal levels again (currently between 50.3-51.2nSv/h.) I know temperature can affect the Radiacode's readings as well, but I am not yet sure.

I have not found much in relation to the subject that fits most of the criteria of this experience (closed-room, single detection source, random background radiation and poor parameters on my end, but still distinct enough from say outside of a single room or even the house; most of what I read measured a large land's-worth of humidity instead and average radiation from multiple sources)

Ultralight keychain size. It's not as sensitive as scintillators but it reacts quickly. The best thing is that I can carry it everywhere. Just disappears in the pocket and is affordable enough as a first Geiger counter.

Technically they say it's a dosimeter. Sorry for the naive question but what's the difference between a Geiger counter and a dosimeter. Afaik it shows accumulated dose but it also shows live readings and it's GM tube based so shouldn't it be a Geiger counter as well?

I just ordered a Radiacode 102. I have some Vasaline and Uranium Glass. But I am wanting more sources. Ores maybe trenitite, I know I can get some from old smoke dectors. But I am wanting some others. "Safe" Stuff to start out with before getting anything hot or that I would need paper work for. Any ideas?