Modification of polyethylene films was carried out by radiation-induced graft polymerization of acrylamide using a preirradiation method. The surface behavior of grafted films as a function of the degree of grafting was determined using contact angle measurements, attenuated total reflectance (ATR), and scanning electron microscopy (SEM). In spite of the presence of hydrophilic polyacrylamide chains, grafted films still showed high hydrophobicity on the surface. ATR results revealed the presence of a polyacrylamide moiety in the surface layer of the films. Interestingly, the contact angle of grafted films did not change much for the entire range of degree of grafting. SEM results showed that the roughness is introduced on the film surface irrespective of the nature of the additive. However, the addition of acetone to the grafting medium was the most effective in increasing the surface roughness.