|
|
|
| Development of A 220Rn Chamber with Inner Sources |
| TANG Fang-dong1, ZHAO Chao2, ZHUO Wei-hai2, et al |
| Shanghai Institute of Measurement and Testing Technology, Shanghai 201203 China |
|
|
|
|
Abstract Objective To develop a 220Rn chamber for calibrations of 220Rn measurement device. Methods Based on a programmable constant temperature and humidity testing device, a 220Rn chamber with inner sources was designed. The granular 220Rn sources were prepared by using the adsorption method of resins. In order to produce a uniform distribution of 220Rn in the chamber, four minielectric fans were used to adjust the wind directions and speeds in the chamber in addition to a reasonable setting of the sources. Results Under the same temperature and humidity conditions, 220Rn concentrations in the chamber fluctuated within only ±3%, and the spatial distribution of 220Rn was nearly homogenous in an effective volume of about 200 L. 222 Rn concentrations in the chamber could be neglected. Conclusion 220Rn concentrations in the chamber are stable and uniform, the chamber can be used for calibration or intercomparison experiments of 220Rn measurements.
|
|
Received: 03 May 2011
|
|
|
|
|
|
|
|
|
