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Radon is a noble radioactive gas that spreads everywhere on Earth. More than half the average natural radiation dose of the population is due to radon and its decay products. Radon is considered one of the major causes of lung cancer, along with smoking. The concept of the geogenic radon potential of the area is based on natural geological settings, which could elevate indoor radon levels. Method assessing the geogenic radon potential originally proposed by Neznal is formed from a measurement of the equilibrium soil gas radon activity concentration (kBq m−3) and the soil gas permeability (m2) at a definite depth (0.8–1.0 m). The article presents a survey of the Sliven Province, performed within the National Science Fund’s project КP-06-Н37/22 to prepare a methodology for a geogenic radon potential map. The radon in soil gas, permeability, as well as gamma dose rate, were measured in different areas during the summer of 2021. The geology of the Sliven area is complex, i.e., presented by rocks formed from the Paleozoic era to the Quaternary period. In situ measurement of soil gas permeability was performed with the RADON-JOK system (Radon v.o.s), the radon concentration in a soil gas with an RM-2 system (Radon v.o.s), and gamma dose rate in the air with dosimeter Rados-RDS 110. The results show a large variation: from 0.9 to 400.7 kBq/m3 for radon in soil gas and from very low permeability values < 1.10−14 to high ones > 1.10−11 m2. The values of the gamma dose rate in the region were from 0.08 to 0.22 μSv/h. The correlation analysis was significant at the 0.05 level (Ro = 0.26, p = 0.16) between radon in soil gas and gamma dose rate, but Spearman’s coefficient was low. The relationship between gamma dose rate and permeability of the area was investigated by regression analysis (Ro = 0.34), which shows statistical significance at level 0.01 (p = 0.002). The analysis indicated that the permeability of the region could be predicted with gamma dose rate results. The survey demonstrates a relationship between the measured environment earth parameters, which can help elaborate a methodology for a prospective geologic radon map of Bulgaria.

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Measurement of Environment Earth Parameters for Assessing Geogenic Radon Potential

  • 会议论文

  • 发表日期：

    2026年

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  • Kremena Ivanova,
  • Bistra Kunovska,
  • Desislava Djunakova,
  • Iren Ilieva,
  • Simeon Valchev,
  • Dimitar Antonov

摘要

Radon is a noble radioactive gas that spreads everywhere on Earth. More than half the average natural radiation dose of the population is due to radon and its decay products. Radon is considered one of the major causes of lung cancer, along with smoking. The concept of the geogenic radon potential of the area is based on natural geological settings, which could elevate indoor radon levels. Method assessing the geogenic radon potential originally proposed by Neznal is formed from a measurement of the equilibrium soil gas radon activity concentration (kBq m−3) and the soil gas permeability (m2) at a definite depth (0.8–1.0 m). The article presents a survey of the Sliven Province, performed within the National Science Fund’s project КP-06-Н37/22 to prepare a methodology for a geogenic radon potential map. The radon in soil gas, permeability, as well as gamma dose rate, were measured in different areas during the summer of 2021. The geology of the Sliven area is complex, i.e., presented by rocks formed from the Paleozoic era to the Quaternary period. In situ measurement of soil gas permeability was performed with the RADON-JOK system (Radon v.o.s), the radon concentration in a soil gas with an RM-2 system (Radon v.o.s), and gamma dose rate in the air with dosimeter Rados-RDS 110. The results show a large variation: from 0.9 to 400.7 kBq/m3 for radon in soil gas and from very low permeability values < 1.10−14 to high ones > 1.10−11 m2. The values of the gamma dose rate in the region were from 0.08 to 0.22 μSv/h. The correlation analysis was significant at the 0.05 level (Ro = 0.26, p = 0.16) between radon in soil gas and gamma dose rate, but Spearman’s coefficient was low. The relationship between gamma dose rate and permeability of the area was investigated by regression analysis (Ro = 0.34), which shows statistical significance at level 0.01 (p = 0.002). The analysis indicated that the permeability of the region could be predicted with gamma dose rate results. The survey demonstrates a relationship between the measured environment earth parameters, which can help elaborate a methodology for a prospective geologic radon map of Bulgaria.