Radiation-grafting of acrylic acid onto LDPE was carried out by both simultaneous irradiation and pre-irradiation techniques. The effects of metal salts, and sulfuric acid addition, and solvent effect on enhancement of grafting yield were evaluated. The dose distributions of the Co-60 gamma irradiation facility and electron beam accelerator were measured using chemical dosimeters and CTA film dosimeters, respectively. An appropriate base PP was selected, and the effects of addition of various additives on the radiation resistance of the polymer. An air distillation column was examined using a Co-60 source to identify the origin of the malfunction of the column. (Author).