Radon dosimetry - comparison of selected measurement methods

Introduction: Recently, the measurement of radon concentration has become one of the necessary procedures for implementation and execution in dosimetry. The aim of this study was to compare effectiveness, accuracy and ease of use of three selected radon measurement methods: one active and two passive.

Material and Methods: Lucas chambers (scintillation method), thermoluminescent detectors (TLD) and track detectors (CR-39) were used. Air measurements were performed for two different locations: Czeladz (C) and Krakow (K). The measuring devices were placed in the basements for a specified time (30 days) and, in case of active detectors, additional measurements were performed in the exposure-reading mode.

Results: For the Lucas chamber, single-day and seasonal measurements were done. For all detectors, results from the winter session (C: 657 ± 16 Bq/m³, K: 825 ± 17 Bq/m³), CR-39 (C: 138 ± 47 Bq/m³, K: 72 ± 35 Bq/m³) and TLD (C: 0.82 ± 0.04 mGy, K: 0.82 ± 0.08 mGy), autumn (C: Lucas chamber 1458 ± 19 Bg/m³, CR-39 430 ± 92 Bq/m³, TLD 0.21 ± 0.01 mGy) and spring (most readings at background level) were compared. Additionally, an attempt was made to convert the obtained radon concentrations into doses.

Conclusion: Lucas chambers, designed for measurements in the exposure-reading mode, can also be used in long-term measurements. Both track and thermoluminescent detectors can be used for long-term measurements. More than one method may be required to obtain accurate measurement information. The results of measurements conducted in the seasonal mode indicate that the implementation of protective procedures, such as systematic ventilation, can contribute to a significant reduction in high radon concentrations.