Analysis of Mathematical Model for Migration Law of Radon in Underground Multilayer Strata

Table 1

Parameters of specific property for the three-layer strata.

Names	Symbols	Units	Values
Convection velocity	𝑣𝑖 (𝑖=1, 2, 3)	m/s	5×10^−6/6×10^−6/4×10^−6
Diffusion coefficient	𝐷𝑖 (𝑖=1, 2, 3)	m^2/s	5×10^−6/4×10^−6/3×10^−6
Porosity	𝜂𝑖 (𝑖=1, 2, 3)	/	0.4/0.3/0.2
Capacity of generating migratory radon	𝐴𝑖 (𝑖=1, 2, 3)	Bq/m^3	3000/4000/5000
Decay constant of radon	𝜆	/s	2.097×10^−6