排序方式： 共有1条查询结果，搜索用时 15 毫秒
1
1.
Soil radon concentration levels in Deir Abu-Said District, Irbid, Jordan were measured for several depths using CR-39 detectors,
in the summer 2004 for six geological formations, namely, Wadi umm ghudran (WG), Wadi esSir “massive” limestone, Amman silicified
limestone (ASL), Al-Hisa phosphatic limestone (AHP), Muwaqqar chalky-marl (MCM), and Basalt. Using a model (Yakovleva in Ann
Geophys 48(1):195–198, 2005) based on the solution of the diffusion equation in the quasi-homogenous approximation, the characteristics of radon transport
were calculated. Radon flux density from the Earth’s surface, the depth Z
eq, at which the equilibrium value of soil radon concentration is reached and the convective radon flux velocity (v) for the different soils are calculated and found to be consistent with similar values presented elsewhere. Calculations
indicate that the soil covering WG has a low radon risk while, on the contrary, AHP has a higher radon risk as expected, since
AHP has higher content of uranium. The other formations have intermediate values. The results of the present study confirm
the statement by Yakovleva (Ann Geophys 48(1):195–198, 2005) that two measurements suffice in order to estimate the characteristics of soil radon transport. 相似文献
1