Determination of Solid Radioactive Waste Activities Using Gamma In-Situ Spectrometer

Measurements of solid radioactive waste activities using in-situ gamma ray spectrometer by mechanically drum rotating system had been conducted. Both measurements should be done namely: first, In-situ gamma spectrometer calibrated by using standard 152Eu source in several drums (drum 1 to drum 5) of 100 liter volume at distance 15 cm from detector and counted them for 2253 seconds then background counting measurement in each drum also counted where a drum was not containing radioactive materials to achieve the lowest detection level. The data result of measurements can be shown as follows: the lowest detection level of insitu gamma ray spectrometer on radionuclide of 137Cs and 60Co was (57 ± 8) Bq and (97 ± 9) Bq. Radiation exposure rate on surface between 0.26 - 100 mR/jam. Total activity of radioactive waste between (423 ± 29) to (114,289 ± 7,459) Bq. So these radioactive materials waste have a high activity waste of group I, because radiation exposure rate less than 0.2 R/hour. (author)