Verification of the quantitative method of caesium radioactivity concentration of decontamination wastes

Yokoyama, Kaoru; Suzuki, Atsuo*; Ishimori, Yuu  

Decontamination wastes contaminated with radioactive cesium (Cs, Cs) are housed in the flexible container bags. Canberra manufactured flexible container concentration measurement car has been developed for the radioactivity measurement of decontamination waste. For reduction of background, the flexible container bags is mounted to the frame, it is measured from the lower side. In the flexible container bag, if there is uneven distribution of the source, it is estimated that quantification error increases. We proposed the method quantifying the shielding situation of rays. Then, it demonstrated that quantification accuracy of radioactivity can be improved.