RADIOACTIVE WASTE SELECTOR

摘要

PURPOSE:To identify radioactive waste as surface contaminated matter or radioactive matter, by comparing with a reference value the ratio of spectrums between beta rays and gamma rays released simultaneously therefrom. CONSTITUTION:beta rays and gamma rays released simultaneously from a radioactive waste 6 are detected with a radiation detector 2 and spectrums thereof are measured with a spectrometer 3. A discriminator 4 compares the ratio of the spectrums between beta rays and gamma rays with a reference value to screen the radioactive waste. It is noted that the transmission power of the beta rays is smaller than that of gamma rays and the beta rays released from a radioactive matter lose more of energy while passing through the radioactive matter itself as compared with the beta rays released from a surface contaminated matter. This inevitably develops a difference between the spectral ratio between the beta rays and gamma rays released simultaneously from the radioactive waste thereby enabling the distinguishing of the waste between both the categories by comparing the spectral ratio with the reference value.