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ASSESSMENT OF RADIUM ACTIVITY CONCENTRATION AND RADON EXHALATION RATES IN IBERIAN PENINSULA BUILDING MATERIALS.

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This study measured radium (226Ra) and radon (222Rn) in Iberian building materials. Higher radium levels in granite correlated with increased radon exhalation rates, impacting indoor radiation exposure.

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Area of Science:

  • Environmental Science
  • Radiological Protection
  • Geochemistry

Background:

  • Radium (226Ra), a natural radioactive element, is found in building materials.
  • Radon (222Rn) gas, a decay product of 226Ra, can increase indoor radiation exposure.
  • Building materials are a significant source of indoor radon.

Purpose of the Study:

  • To quantify radium activity concentration in common Iberian building materials.
  • To measure radon exhalation rates from these materials using active and passive techniques.
  • To investigate the relationship between radium concentration and radon exhalation.

Main Methods:

  • Gamma-ray spectrometry for radium (226Ra) activity concentration measurement.
  • Continuous radon monitor (active technique) and solid-state nuclear track detectors (passive technique) for radon (222Rn) exhalation rates.
  • Analysis of various building materials from the Iberian Peninsula.

Main Results:

  • Mean 226Ra activity concentrations ranged from 5.0 to 123.4 Bq kg-1.
  • Granite samples exhibited higher radon exhalation rates compared to other materials.
  • A positive correlation was observed between 226Ra concentration and radon exhalation rates.

Conclusions:

  • Building materials, especially granite, can be sources of indoor radon.
  • Radium content is a key factor influencing radon exhalation from construction materials.
  • Findings are crucial for assessing and mitigating indoor radiation risks.