Building with reclaimed building materials is a great way to reduce the environmental footprint of a building. LEED and GreenPoints both award points for use of reclaimed materials. However, some reclaimed materials can be radioactive.
Fly ash is the material left over from burning coal. A waste product with little other use, it is sometimes added to concrete or bricks. However, if the original coal contained radioactive isotopes, those isotopes will be greatly concentrated in the ash.
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