Comparative analysis of radon, thoron and thoron progeny concentration measurements

J Radiat Res. 2013 Jul 1;54(4):597-610. doi: 10.1093/jrr/rrs129. Epub 2013 Jan 7.


This study examined correlations between radon, thoron and thoron progeny concentrations based on surveys conducted in several different countries. For this purpose, passive detectors developed or modified by the National Institute of Radiological Sciences (NIRS) were used. Radon and thoron concentrations were measured using passive discriminative radon-thoron detectors. Thoron progeny measurements were conducted using the NIRS-modified detector, originally developed by Zhuo and Iida. Weak correlations were found between radon and thoron as well as between thoron and thoron progeny. The statistical evaluation showed that attention should be paid to the thoron equilibrium factor for calculation of thoron progeny concentrations based on thoron measurements. In addition, this evaluation indicated that radon, thoron and thoron progeny were independent parameters, so it would be difficult to estimate the concentration of one from those of the others.

Keywords: radon; thoron; thoron equilibrium factor; thoron progeny.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Air Pollution, Indoor / analysis
  • Calibration
  • Environmental Monitoring / methods
  • Environmental Monitoring / standards*
  • Housing
  • International Cooperation
  • Oxidative Stress
  • Radiation Monitoring / methods
  • Radiation Monitoring / standards*
  • Radioactive Pollutants / analysis*
  • Radon / analysis*
  • Radon Daughters / analysis*
  • Reproducibility of Results
  • Software


  • Radioactive Pollutants
  • Radon Daughters
  • Radon