The OSHA radon exposure limit is an average concentration for 40 hours in any workweek of 7 consecutive days. The still applicable 1971 radon-222 exposure limit for adult employees is 1 x 10-7 microcuries per milliliter (µCi/ml) [100 picocuries/liter (pCi/L)] averaged over a 40-hour workweek.
What type of buildings are most affected by radon?
Indoors, radon is therefore present everywhere. Old buildings are more often affected than new ones, buildings with basement more often than buildings without basement.
Which type of foundation has no risk of radon gas?
Intuitively basement is the least safest option since it's closest to soil, slab-on-grade is in the middle with radon leaking through the cracks in the slab and crawl space is the safest with its elevated foundation.
Which one of the occupational groups is especially subject to radon progeny exposure?
Due to the high airborne levels of radon and its progeny, the most frequent occupational exposures to radon typically result from employment in underground uranium and other hard- rock mining (NIOSH 2006).
What building materials are radon exposure?
Building materials, such as brick, marble and granite, contain very low-levels of naturally-occurring radioactivity. However, these materials can emit radon as the materials decay, which can elevate the indoor radon levels in your home. It's important to test your home for radon and to correct elevated levels.
How long do you have to be exposed to radon to be affected?
There are no immediate signs or symptoms from breathing in background radon. Repeated exposure over time — around 20 years — can lead to cancer development, especially if you are also a smoker. Symptoms of lung cancer may include: Chest pain.