Radon Exposure and Lung Cancer Risk Analysis

Radon is a colourless, odourless radioactive gas arising from the decay of uranium in soil and rock. It can seep into buildings through foundations, accumulating to levels that pose a significant health risk. Inhalation of radon and its decay products delivers alpha-particle radiation to lung tissue, causing DNA damage and increasing the likelihood of malignant transformation. Epidemiological evidence identifies radon as the second leading cause of lung cancer after tobacco, with risk magnified among smokers but also notable in never-smokers. Risk assessment relies on indoor concentration measurements, dosimetric models that estimate equilibrium between radon and its progeny, and excess relative risk models that quantify cancer risk per unit exposure. Globally, residential radon contributes to a substantial proportion of lung cancer mortality, prompting building codes, mitigation strategies such as soil depressurisation and membrane barriers, and public-health guidelines to reduce indoor levels. Recent efforts integrate geospatial mapping, Bayesian approaches to predict high-risk dwellings, and modern construction data to refine exposure estimates and prioritise remediation.

Research from Nature Portfolio

Recent studies have refined dosimetric assessment of indoor radon and its progeny, reporting annual effective doses and emphasising the often-underappreciated contribution of thoron to total inhalation dose. Investigations in mountainous regions have used passive detectors to establish equilibrium factors and calculate site-specific inhalation doses, confirming that even regions with moderate radon concentrations may warrant attention when thoron is considered. Another analysis of North American residential buildings utilises large-scale testing paired with geological and architectural data to reveal a steady rise in modern radon levels. This work highlights how newer construction features—such as greater ceiling heights and airtight envelopes—correlate with increased indoor radon, and demonstrates minimal seasonal variation in many homes, challenging conventional correction factors.

Radon Exposure and Lung Cancer Risk Analysis publication trend

The graph below shows the total number of articles in radon exposure and lung cancer risk analysis across all publications each year (not limited to Nature Index journals).

Technical terms

Radon (222Rn): A naturally occurring radioactive noble gas generated by uranium decay in soil and rock.

Becquerel per cubic metre (Bq/m³): SI unit for radioactivity concentration, denoting one nuclear decay per second in a cubic metre of air.

Population attributable fraction (PAF): The proportion of disease incidence in a population that can be attributed to a specific exposure.

Excess relative risk (ERR): The proportional increase in disease risk per unit of exposure above the baseline risk.

Equilibrium factor: Ratio of airborne radon progeny activity to radon gas concentration, used to convert gas measurements into dose estimates.

References

1. Environmental impacts of waterproof membranes with respect to their radon resistance. Sustainable Materials and Technologies (2023).
2. Dose estimation derived from the exposure to radon, thoron and their progeny in the indoor environment. Scientific Reports (2016).
3. Global Estimate of Lung Cancer Mortality Attributable to Residential Radon. Environmental Health Perspectives (2018).
4. Radon exposure is rising steadily within the modern North American residential environment, and is increasingly uniform across seasons. Scientific Reports (2019).
5. General Overview of Radon Studies in Health Hazard Perspectives. Journal of Oncology (2021).
6. Attributable risk of lung cancer deaths due to indoor radon exposure. Annals of Occupational and Environmental Medicine (2016).
7. The Cellular and Molecular Carcinogenic Effects of Radon Exposure: A Review. International Journal of Molecular Sciences (2013).
8. From the European indoor radon map towards an atlas of natural radiation. Radiation Protection Dosimetry (2014).