Results 171 to 180 of about 5,509,012 (200)

Natural radioactivity and radon exhalation rate in Brazilian igneous rocks

Applied Radiation and Isotopes, 2011
This paper reports the natural radioactivity of Brazilian igneous rocks that are used as dimension stones, following the trend of other studies on the evaluation of the risks to the human health caused by the rocks radioactivity as a consequence of their use as cover indoors. Gamma-ray spectrometry has been utilized to determine the (40)K, (226)Ra and (
Moura, C. L., Artura, A. C., Bonotto, Daniel Marcos, Guedes, S., Martinelli, C. D.   +4 more
openaire   +3 more sources

Development and application of a continuous measurement system for radon exhalation rate

Review of Scientific Instruments, 2011
A continuous measurement system, with a ventilation-type accumulation chamber, was developed for radon exhalation rate determination. A reasonable sampling flow rate for the measurement system was determined by comparing the values obtained by the system with those obtained by a grab sampling method.
Masahiro, Hosoda, Tetsuo, Ishikawa, Atsuyuki, Sorimachi, Shinji, Tokonami, Shigeo, Uchida   +4 more
openaire   +2 more sources

Revision for measuring radon exhalation rate in open loop

Journal of Instrumentation, 2013
We propose a novel method for quickly measuring the radon exhalation rate in open loop. We first obtain the temporal variation of radon concentration in the internal cell of the RAD7 by analyzing the work principle of RAD7. We then obtain the temporal variation of radon concentration in the ventilation-type accumulation chamber when the effects of ...
Y Tan, D Xiao, H Yuan, Q Tang, X Liu
openaire   +1 more source

Measurement of the radon exhalation rate from the medium surface by tracing the radon concentration

Journal of Radioanalytical and Nuclear Chemistry, 2012
The paper will present a method based on the accumulation chamber technique for measuring of radon exhalation from the medium surface. A radon monitor traces the change of radon concentration in the accumulation chamber, and then the radon exhalation can be obtained accurately through linear fit.
Yanliang Tan, Detao Xiao
openaire   +1 more source

Measuring radon exhalation rate through three cycles

Journal of Instrumentation, 2012
This paper proposes that the radon exhalation rate can be calculated through three measurement cycles performed by a radon monitor based on the electrostatic collection method. The first cycle time is 20 min, the measured value in this cycle falls into disuse. The radon concentrations in the next two long cycles can be accurately measured.
Y Tan, D Xiao
openaire   +1 more source

Influence of Humidity on Building Material's Radon Exhalation Rate

Applied Mechanics and Materials, 2013
In this paper, the humidity of building materials were controlled by adopting the inorganic salts saturated solutions, and the radon exhalation rate of building materials were measured by the active carbon method which under the different humidity conditions.
Dong Ji, Zhong Yang Xu, Yun Tao Zhang
openaire   +1 more source

Continuous measurement of radon exhalation rate of soil in Beijing

Journal of Radioanalytical and Nuclear Chemistry, 2014
To understand the level of radon exhalation rate from soil surface and its variation, a continuous measurement system was developed and applied for a field measurement in Beijing from April 2012 to February 2013. For seasonal variation, It was indicated by measurement results that radon exhalation rate was higher in spring (52.9 mBq m−2 s−1 in average)
Lei Zhang, Qiuju Guo, Ke Sun
openaire   +1 more source

Measurements of radon exhalation rate for monitoring cement hydration

Materials and Structures, 2006
The paper deals with one of the physical methods, which can be used for monitoring hydration of cementitious materials: the radon exhalation method. Experiments with two types of hydrating cement paste (made with water to cement ratios of 0.25 and 0.33) are described. The kinetics of shrinkage and hydration heat development are discussed.
openaire   +1 more source

Radioactivity and Radon Exhalation Rate of Some Granite Building Materials in Türkiye

Applied Radiation and Isotopes
The presence of elevated concentrations of naturally occurring radionuclides in building materials can lead to the generation of high dose rates within indoor environments, resulting from both internal and external exposure pathways. The internal dose is mainly attributable to radon exhalation from the building materials, whereas the external dose is a
openaire   +2 more sources

Experimental Study on the Mechanism of Radon Exhalation During Coal Spontaneous Combustion in Goaf

Tunnelling and Underground Space Technology, 2021
Cunbao Deng
exaly