Hi all.

I've recently undertaken a bit of DIY in my basement and did a bunch of drilling and hand-sawing some AIB boards in the ceiling (thinking it was just plasterboard). Decided to get it tested after realizing it could be asbestos, and unfortunately it came back positive for amosite (brown) asbestos. I know this was incredibly stupid, but I was just ignorant to the risks.

The room was sealed off and all precautions taken since, with a certified contractor visiting to explore abatement options.

I wouldn't be anywhere near as worried if it was just white asbestos, however, I'm terrified at how much amosite I may have inhaled. I read in a paper that AIB can release up to 20f/ml of amosite when cut or drilled, and with what I seem to read that there's no low threshold risk for mesothelioma, I'm worrying that I'll spend the rest of my life wondering if it's going to pop up at any moment. 

Is anyone able to quantify if my activity counts as a big enough exposure to be placed in a significant risk bracket? I know with white asbestos it's much more of a cumulative effect, but I'd love to hear from anyone who is more knowledgeable about amosite exposure specifically.

Everything I read says amosite boards are generally not a risk unless you disturb it... but what is the risk if I did?

Many thanks