// Scilab code Exa1.4.7 : Determination of radius of Pb-208 : Page 36 (2011)
A = 208; // Mass number of Pb-208
r0 = 1.2e-015; // Distance of closest approach, m
r = r0*((A)^(1/3)); // Radius of Pb-208, m
printf("\nThe radius of Pb-208 : %4.2e m", r)

// Result
//    The radius of Pb-208 : 7.11e-015 m