Towards a Brazilian radon map: consortium radon Brazil.

Area of Science:

• Environmental Science
• Geology
• Public Health

Background:

• Indoor radon is a potential health risk, though often underestimated in Brazil due to assumed high ventilation rates.
• Scattered measurements indicate regionally elevated indoor radon concentrations (up to a few hundred Bq m⁻³).
• Brazil's diverse geology suggests potential for significant geogenic radon sources in various regions.

Purpose of the Study:

• To address the emerging need for a national radon map of Brazil.
• To coordinate existing radon survey efforts across the country.
• To plan and initiate a large-scale Brazilian radon survey.

Main Methods:

• Coordination of existing radon surveys conducted by different research groups.
• Discussions and planning for a nationwide radon mapping initiative.
• Assessment of geogenic radon potential based on geological diversity.

Main Results:

• Initial coordination efforts and discussions occurred at the First Brazilian Radon Seminary in 2012.
• Evidence of moderately high indoor radon levels in specific regions contradicts general assumptions.
• Identification of diverse geological areas with high geogenic radon potential.

Conclusions:

• A comprehensive Brazilian radon survey is necessary despite perceived challenges.
• Understanding indoor radon distribution is crucial for public health and environmental quality.
• Geological factors play a significant role in indoor radon levels across Brazil.