What is the maximum allowable exposure limit for radon for workers over a five-day period?

The maximum allowable exposure limit for workers over a five-day period is established based on protecting their health from the effects of radon exposure. The correct answer of 4 WLM (Working Level Month) or 5700 pCi/L (picocuries per liter) is derived from guidelines that prioritize reducing potential risks associated with radon, particularly in occupational settings where exposure may be prolonged or consistent.

WLM is a measurement that quantifies the cumulative exposure to radon decay products, providing a more meaningful representation of radon’s potential health impacts over time in specific work environments. The limit reflects the recognized threshold below which workers can operate with reduced risk of adverse health effects, such as lung cancer, which is notably associated with radon exposure.

In occupational safety guidelines, the specified allowable exposure limits are crucial for regulating environments where radon may be elevated, ensuring that necessary precautions and monitoring practices are in place to protect workers.