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In this paper, the absorption of β and γ radiation in different polymers was studied, in order to determine the absorption coefficients of the half life thickness in these type of materials. With the help of these experimental data, the global β and γ radioactivity of some radioactive waste, packed in different plastic bags, coming from nuclear medicine departments, can be estimated.

Also, the β spectrometry with huge plastic scintillators was established, in order to evaluate the global activity of β-pure radioactive waste by using a calibration in energy with Compton electrons.

The β global measurements were performed over regions of interest ROI, established for each determined radioisotope. It also was demonstrated that the γ radiation has a weak attenuation in such materials, its dependence of the thickness being almost linear.

Keywords: Polymers degradation, Gamma irradiation and Spectroscopic methods