Calibration of CR-39 solid state nuclear track detector

Radon and its progenies are the main cause of lung cancer when they are trapped inside the lungs. Therefore, the radon activity concentration in air, water and soil samples should be measured, monitored and analysed. In this paper, river sediment samples collected from 30 different locations of Mahajran River, Basra, Iraq, were studied by using solid-state nuclear track detector type CR39. The track detector used for this purpose must be calibrated for concentrations of radon, Thoron and their daughters likely to be found in samples. The chamber used in the present calibration work had a volume of 125 L and contained a standard radon source (226Ra) and radon distribution fan. Results illustrated the dependence of the CR-39 calibration factor on the dosimeter height. The calibration factor used in this application was 0.34±0.0 Tr/cm2·day / Bq·m−3 for a height of 10 cm.

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CR-39 detector-based Radon dosimetry system calibration in the self-decay mode

Lüley

Filova

Blahušiak

et al. 2023

Eur. Phys. J. Spec. Top.

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This paper describes cooperation of the Slovak University of Technology in Bratislava (STU) and the Slovak Institute of Metrology (SMU) in the verification of the calibration factors for the solid-state nuclear track detector utilized for radon dosimetry and establishing traceability for the STU laboratory. The SMU operates the Air Radon Standard which consists of a radon chamber and calibrated radon atmosphere monitoring system. A specification of the radon chamber is that the radon concentration changes during the exposure time. The radon atmosphere is created by the insertion of a specified amount of radon gas into the chamber, which subsequently decays over time. The STU laboratory is equipped with the TASLImage™ system for radon dosimetry with corresponding TASTRAK CR-39 type detectors and diffusion chambers. These chambers allow radon to diffuse inside and prevent dust and radon progeny to enter the container. Each diffusion container is characterized by its own diffusion rate, which should be considered in the metrology calibration approach, especially when the radon chamber is operated in the decay mode. Therefore, several measurements were carried out to determine the optimal condition for conversion factor verification. The experiments were conducted for low radon concentrations, but still in the range that the radon chamber can reliably provide (100 Bq m−3 to 100 kBq m−3) and in combination with several times of exposure. Based on the achieved results the default calibration factor was verified, and an optimal calibration approach was proposed. To improve the capability of the radon measurement, a custom diffusion container design was proposed. The design incorporates compact dimensions with an aerosol filter at the entrance to the container. This allows to increase in an entry hole and thus increases the diffusion rate. Subsequently, the homogeneity of the radon atmosphere in the chamber was tested.

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Calibration of CR-39 solid state nuclear track detector

Cited by 4 publications

References 7 publications

Estimation of radon activity concentration in Abu Al-Khaseb and Ad Dayer soil in southern Iraq using CR-39 detector

Estimation of radon activity concentration in Abu Al-Khaseb and Ad Dayer soil in southern Iraq using CR-39 detector

Calibration of CR-39 for different heights of radon dosimeters and application of radon concentration in Mahajran River sediment in Basra Governorate, Iraq

CR-39 detector-based Radon dosimetry system calibration in the self-decay mode

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