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Published on: October 21, 2016
Activity measurements of radon from construction materials
L Fior1, J Nicolosi Corrêa, S A Paschuk
1Federal University of Technology-Paraná, UTFPR, Av. Sete de Setembro, 3165, Curitiba, PR 80230-901, Brazil.
Summary
Radon concentration in Brazilian construction materials like bricks and blocks was measured. Wall painting significantly reduced radon emanation, and materials are safe for use, posing no risk below the dose limit.
Area of Science:
- Environmental Science
- Radiological Protection
- Materials Science
Background:
- Radon (Rn) is a naturally occurring radioactive gas that can accumulate indoors.
- Construction materials can be a source of indoor radon, impacting human health.
- Assessing radon emanation from building materials is crucial for public safety.
Purpose of the Study:
- To measure radon concentration in Brazilian construction materials.
- To evaluate radon emanation during different construction stages.
- To assess the safety of these materials regarding radiation exposure limits.
Main Methods:
- Utilized sealed chambers to measure radon concentration and emanation.
- Employed polycarbonate etched track detectors for radon detection.
- Conducted gamma-ray spectrometry to analyze radionuclide activity (226Ra, 232Th, 40K).
Main Results:
- Wall painting with acrylic varnish reduced radon emanation by approximately 50%.
- Activity concentration index (I), radium equivalent activity (Raeq), and external hazard index (Hext) were within safe limits.
- Clay bricks and concrete blocks showed no restrictions for use based on radiation dose.
Conclusions:
- Construction materials in Brazil, including clay bricks and concrete blocks, are safe for use.
- Specific finishing steps, like wall painting, can effectively mitigate radon emanation.
- Further research can focus on other materials and mitigation strategies.
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