Research on the method to measure the average radon exhalation rate of room inner surface
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
In high-rise buildings, radon from building materials is one of the main sources of indoor radon. People spend an average of 80 % of their time indoors every day. Therefore, the measurement of the average radon exhalation rate of the room inner surface is of great significance to human health. This paper presents a method for measuring the radon exhalation rate from indoor surfaces using the accumulation chamber technique. During the experiment, the entire sealed chamber acted as an accumulation chamber, with the RAD7 placed inside for openloop radon concentration measurements. This is equivalent to using the RAD7 for closed-loop measurements of the entire sealed chamber. The measurement data was then fitted using a nonlinear model to obtain the average radon exhalation rate from the room’s interior surfaces. The measurement results from multiple experiments demonstrated good consistency, with the average radon exhalation rates from indoor surfaces being 16.38 ± 1.60 Bq m 2 h 1, 16.56 ± 1.77 Bq m 2 h 1, and 15.34 ± 1.37 Bq m 2 h 1, and the effective decay constants also being 0.10 ± 0.01 h 1, 0.09 ± 0.01 h 1, and 0.06 ± 0.01 h 1. Based on this, the indoor radon concentration under different ventilation rates can be estimated from the measured radon exhalation rates.
Abstract
In high-rise buildings, radon from building materials is one of the main sources of indoor radon. People spend an average of 80 % of their time indoors every day. Therefore, the measurement of the average radon exhalation rate of the room inner surface is of great significance to human health. This paper presents a method for measuring the radon exhalation rate from indoor surfaces using the accumulation chamber technique. During the experiment, the entire sealed chamber acted as an accumulation chamber, with the RAD7 placed inside for openloop radon concentration measurements. This is equivalent to using the RAD7 for closed-loop measurements of the entire sealed chamber. The measurement data was then fitted using a nonlinear model to obtain the average radon exhalation rate from the room’s interior surfaces. The measurement results from multiple experiments demonstrated good consistency, with the average radon exhalation rates from indoor surfaces being 16.38 ± 1.60 Bq m 2 h 1, 16.56 ± 1.77 Bq m 2 h 1, and 15.34 ± 1.37 Bq m 2 h 1, and the effective decay constants also being 0.10 ± 0.01 h 1, 0.09 ± 0.01 h 1, and 0.06 ± 0.01 h 1. Based on this, the indoor radon concentration under different ventilation rates can be estimated from the measured radon exhalation rates.