Effect of the [TiO2] on the radiation attenuation properties on the human tissue simulator obtained from radiovulcanized natural rubber latex

In this paper was studied the concentration effect of TiO2 used as filler in the radiation attenuation properties of human tissue simulator obtained from radio vulcanized natural rubber. The studied parameters were the following: the mass stopping power (Smas), the depth at maximum dose (Zmax), the depth at 50% of maximum dose (R50) the radiotherapeutic range (RR80) and the electrons range (R). The natural rubber latex was formulated with [n-butyl acrylate ] = e phr and [KOH] = 0,2 phr and radio vulcanized by gamma rays (10 kGy) from 60 Co source. The filler TiO2 was added (0-16 phr). The natural rubber slabs were obtained by casting method and theirs absorbed dose behavior was studied for each filler concentration using electrons beam (6 MeV) from an accelerator. The results showed that the addition of each phr of filler promoted the decrease of 0.019 cm for Zmax, 0.021 cm for RR80, 0.033 cm for R and 0.026 cm for R50 up to [Ti O2] 15 phr. The Smas increased from 1.72 MeVcm2g-1 to 2.00 MeVcm2g-1 in the filler concentration range of 0-16 phr. The filler must be used in the 12-15 phr range. (author)