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Articles by W Zhuo
Total Records ( 3 ) for W Zhuo
  W Zhuo , B Chen and M. Wei

For estimating indoor thoron (220Rn) progeny concentrations with 220Rn measurements, both theoretical studies and field measurements were carried out in this work. Based on the theoretical study, it was found that the exhalation rate of 220Rn (ETn) could be optimally assessed with the 220Rn concentration measured at a point of 50 cm far from the source wall, and the equilibrium equivalent thoron concentration (EETC) could be further estimated with the ETn and the area of wall surface as well as the room volume. Field measurements testified that the estimated EETCs were in general agreement with the directly measured results with an average ratio of 0.87 ± 0.12. The new method developed in this study is thought to be preferable for long-term and large-scale surveys of indoor EETC.

  C Zhao , W Zhuo , B Chen and H. Zhang

For calibration and intercomparison experiments, a thoron chamber with an inner volume of 300 l was designed based on a programmable constant temperature and humidity testing device in this work. The commercial lantern mantles enriched with 232Th were used as the 220Rn source and the mantles were set in 3x3x3 points of lattice style inside the chamber. Experimental studies showed that 220Rn concentrations in the chamber could be easily controlled and adjusted from about 0.5 to 80 kBq m–3 through manual settings of the relative humidity and temperature, and the spatial distribution of 220Rn in the chamber was fairly homogeneous.

  F Tang , W Zhuo , C Zhao , B Chen , Y Xu and L. He

For accurate measurements of 220Rn concentration with airflow-through scintillation cell method, a theoretical study was performed for discussing the influences of sampling flow rate, volumes of sampling tube and scintillation cell on the measurements. It is found that a high flow rate and a large inner volume of scintillation cell as well as a small inner volume of sampling tube are not only preferable for measuring low levels of 220Rn, but also helpful for enhancing the measurement accuracy. In calibration experiments, both the sampling flow rate and the sampling tube volume should be noted. The variations of the flow rate and tube volume should be considered for accurate measurements in the fields.

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