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I have absolutely no idea, but it is in interesting question and until someone more cluey can chime in a quick search suggests: - Florida is using photogypsum
by roenxi 1y ago
I have absolutely no idea, but it is in interesting question and until someone more cluey can chime in a quick search suggests:
- Florida is using photogypsum - https://www.ijpr.org/npr-news/2023-06-30/florida-moves-forward-on-radioactive-road-paving-plan-as-gov-desantis-signs-new-law https://www.ijpr.org/npr-news/2023-06-30/florida-moves-forwa...
- Photogypsum in the US is banned if it radiates at >0.4 Bq/g of 226 Ra. https://en.wikipedia.org/wiki/Phosphogypsum https://en.wikipedia.org/wiki/Phosphogypsum
- Granite radiates at maybe 450 Bq/kg -> 0.45 Bq/g of 226 Ra. https://www.nature.com/articles/jes200944 https://www.nature.com/articles/jes200944
So it looks like we're dealing with pretty standard rock. If this stuff was going to be banned without special permitting it is probably a little more risky than a granite kitchen-top counter if someone goes and sits on the road all day. Although this all raises the question of whether granite should be legal as a building material given that people get twitchy about this stuff - I doubt anyone can prove that granite is safe in this context.
- generic92034 1y agoMaybe abrasion creating dust to be inhaled by humans makes the difference here.
- ben_w 1y agoI expect it to — roads wear down and need resurfacing often enough, and that stuff has to go somewhere, either into the air as dust or dissolved in the rain and run off into the soil.
- roenxi 1y agoIt's plausible, but I think the experience thus far is any dust in the lungs is a health risk. Asbestos will not be soon forgotten. I'd be more worried about testing phosphogypsum's mechanical properties before anyone starts testing the radioactive ones. And danger relative to tyre rubber; although that has probably already been studied somewhere since it is an obvious thing to check.