Zhao, C.; Liu, J.; Chen, Y.; He, L.; Tang, F.; Zhuo, W. Thoron Gas Measurement Using Airflow-Through Scintillation Cell with Consideration of Progeny Deposition. Atmosphere2023, 14, 831.
Zhao, C.; Liu, J.; Chen, Y.; He, L.; Tang, F.; Zhuo, W. Thoron Gas Measurement Using Airflow-Through Scintillation Cell with Consideration of Progeny Deposition. Atmosphere 2023, 14, 831.
Zhao, C.; Liu, J.; Chen, Y.; He, L.; Tang, F.; Zhuo, W. Thoron Gas Measurement Using Airflow-Through Scintillation Cell with Consideration of Progeny Deposition. Atmosphere2023, 14, 831.
Zhao, C.; Liu, J.; Chen, Y.; He, L.; Tang, F.; Zhuo, W. Thoron Gas Measurement Using Airflow-Through Scintillation Cell with Consideration of Progeny Deposition. Atmosphere 2023, 14, 831.
Abstract
Accurate measurement of low-level thoron gas and high-accuracy calibration of thoron measurement devices are essential for assessing and preventing thoron radiological risks. This study aimed to develop a thoron gas measurement technique using an airflow-through scintillation cell for both low-level measurement and high-accuracy calibration. To achieve this, a compartment model was developed to estimate the influence of progeny deposition and accumulation on the wall of the scintillation cell to prevent overestimation of thoron. A self-developed scintillation cell was utilized to implement and validate this technique. The lower detection limit and measurement uncertainty were then evaluated to assess the feasibility of the technique for low-level measurement and high-accuracy calibration. The results showed that the compartment model effectively addressed the influence of the progeny deposition. The measurement technique achieved a lower detection limit below 100 Bq m-3 even with the coexistence of 100 Bq m-3 of radon and attained a measurement uncertainty (k = 2) below 10% when the concentration of thoron exceeded 1,000 Bq m-3. In summary, this study developed a reliable and practical thoron gas measurement technique using an airflow-through scintillation cell with consideration for progeny deposition, and is expected to contribute to the assessment and prevention of thoron radiological risk.
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