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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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This study presents an improved indoor radon map for Spain, utilizing over 12,000 measurements. The enhanced map provides a clearer picture of public exposure to radon and supports future health studies.

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Area of Science:

  • Environmental Health
  • Radiation Protection
  • Geographic Information Systems

Background:

  • Indoor radon exposure poses a public health risk through inhalation of radon and its progeny.
  • Radon mapping is crucial for public awareness, policy-making, and epidemiological research on natural radiation exposure.
  • European recommendations and national needs guide the development of effective radon mapping strategies.

Purpose of the Study:

  • To present the results of a new, improved indoor radon map of Spain.
  • To detail the criteria used to enhance the number and statistical significance of radon measurements.
  • To update the understanding of residential radon exposure across Spain.

Main Methods:

  • Utilized approximately 12,000 indoor radon measurements collected since the late 1980s.
  • Focused on data from a comprehensive campaign conducted between 2009 and 2012.
  • Developed a new map based on a 10 × 10 km² grid, incorporating improved measurement criteria.

Main Results:

  • A new version of the Spanish national indoor radon map has been created.
  • The updated map benefits from an increased number of measurements and enhanced statistical significance.
  • The mapping provides a detailed overview of indoor radon levels in residential areas.

Conclusions:

  • The improved indoor radon map offers valuable data for public health authorities and researchers.
  • This mapping initiative supports targeted interventions and further studies on radon-related health effects.
  • The methodology enhances the reliability and utility of national radon exposure assessments.