Temperature dependences of the second virial coefficients of 19F magnetic shielding due to pair CF4-X, SF6-X, X-Xe, Kr, and CH4 interactions in gas phase are determined experimentally. The dependences are similar within the temperature range 185-400 K. The scale of the curves obtained is shown to be proportional to a complex including the interaction potential parameters, ε2R03. The effect of the chemical surrounding of fluorine atoms on the response of the shielding electron-shell magnetic field to interaction with the surroundings can be characterized by parameter C specific of each particular probe molecule. The CCF4/CSF4 = 1.56 ratio is evaluated.