Affiliation:
1. National Institute of Radiological Sciences, National Institutes for Quantum & Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba, Japan
2. National Institute for Radiological Protection and Nuclear Safety, 2 Xinkang Street, Deshengmenwai, Xicheng District, Beijing, China
Abstract
Abstract
Short-term measurements were made in four different types of Chinese cave dwellings, ‘ground’, ‘open-cut’, ‘aboveground’ and ‘underground’, located in Gansu Province, China, in order to evaluate the diurnal and seasonal variations in indoor radon (222Rn) and thoron (220Rn) concentrations. As a result, in most of the ‘ground’ and ‘open-cut’ cave dwellings in summer, the indoor 222Rn concentrations during the nighttime were higher than those during the daytime. In the winter, such fluctuation was not observed. The daily indoor 222Rn concentrations in summer were higher than those in winter, excluding the ‘aboveground’ cave dwelling, and these concentrations depended on dwelling type, exhalation from the building materials and ventilation. In contrast with 222Rn, there seemed to be only very slight clear variations in 220Rn.
Publisher
Oxford University Press (OUP)
Subject
Public Health, Environmental and Occupational Health,Radiology Nuclear Medicine and imaging,General Medicine,Radiation,Radiological and Ultrasound Technology
Cited by
7 articles.
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