Dependence of the LR-115 radon detector calibration factor on track density

• Calibration factor of LR115 track detectors for radon measurement have been studied.
• The dependence of the calibration factor vs. radon exposure/track density is derived.
• The correction of radon exposure is performed directly on the calibration factor.
• The new approach corrects radon exposure for saturation effect on the film surface.
• The trend of calibration factor has been justified in terms of saturation effect.

The reliability and accuracy of the methodology based on using LR-115 track detectors for radon measurements have been studied by determining the dependence of their calibration factors on radon exposure at levels reaching 13 MBq m−3 h. This factor results not constant and demonstrated a decreasing exponential trend vs. exposure that has been explained in terms of the saturation effect and verified using a numerical simulation. This dependence does not affect the parameter that normalizes track density vs. film thickness. This parameter results constant and equal to - 0.30±0.02 cm−2/µm in the 300–8000 kBq h m−3 exposure range.