Math Model of Grain Size Distribution Versus Radon Content of Wadi Arar, Kingdom of Saudi Arabia
Comparing to other fractions, Coarse and fine sand is highly correlated with radon content with correlation
coefficients of - 0.79 and 0.80 respectively. A polynomial of 3 rd degree is the best math model representing the relation
between the grain size content and it is correlated with radon content. At Coefficient of Determination, R 2 equal to 82%, the
relation between grain size of coarse and fine sand and radon contents is fitted with polynomials of 3 rd degree. Radon content
can be deduced depending on the grain size distribution instead of direct measurement using the polynomial model that
created. At the radon point of view and for safety purpose, gravel, coarse and medium sand and silt and clay are the best
material for construction because of the negative or very weak correlation between them.
Keywords- grain size distribution, CR-39, Radon, soil classification, polynomial.