The problem is secondary irradiation. Everything contaminated by exposure - even a car - has to be taken, destroyed and the waste dealt with as radioactive waste.
Wow.
Like, you mean the entire 800 million tonnes of iron ore per annum delibrately exposed to radiation guages such as this all needs to be treated as radioactive waste?
Even after it's been turned to steel and worked into bridges, building, cars, etc?
I hadn't realised things were that serious :/
Still, I guess reality is in the middle ground and there are degrees to contamination here.
For that reason metal recyclers run routine radiation scans on all incoming materials before contaminated material enters the supply chain [1][2]. And there have been a number of such incidents[3][4].
[1] https://www.epa.gov/radtown/radioactive-material-scrap-metal
[2] https://www.hse.gov.uk/waste/radioactive-contamination.htm
[3] https://k1project.columbia.edu/a11
[4] https://www.recyclingtoday.com/article/radioactive-scrap-thr...
Just to be clear here .. are you actually claiming that raw iron ore tumbling through a loadout and being density scanned:
* actually contaminates the ore and converts it into the equivilant of radioactive waste?
* that metal recyclers are finding signs of > 800 million tonnes per annum of radiated metals?
* that no one has noticed this and seen fit to write an evironmental study paper about it?
Is there any chance here you conflating actual radioactive metals turning up in recycled metals with what is a long standing global practice that doesn't created dangerous radiatctive iron?
You are regularly irradiated at the dentist, the hospital, in a plane, and in the produce aisle.
You have no idea what you're talking about, and you are the problem.
Americium is used in smoke detectors, and I assume doping with small amounts of radioactive materials occurs in other applications where encouraging cold sparking or arcing is desired.
Thorium is used in some (arc) welding rods:
https://ehss.energy.gov/SESA/Files/corporatesafety/safety_bu...
https://www.epa.gov/radiation/radionuclide-basics-thorium
Have a great day!