| 摘要 |
PURPOSE:To enable identification of a radioactive pollutant and a radioactive matter without breaking an object by obtaining a correlation of a ratio of scattered gamma rays to direct gamma rays of a radioactive waste measured a plurality of planes. CONSTITUTION:A radiation detector 1 is arranged on both sides of an object 3 to be measured and the perimeter thereof is covered with a shielding container 2. A signal obtained from the detector 1 is subjected to a forward amplification 4 and a linear amplification 6 and the signal is converted 7 to digital from analog. A process memory 8 performs a signal processing to display an output with a calculator 9. gamma rays from a pollutant A with a pollutant 10 existing on the surface of the object 3 are detected/directly being little scattered by material. But when the object 3 is a radioactive matter B, radioactivity has gammarays released from the inside of the material and hence. more scattered gammarays are detected 1 as compared with the pollutant A in addition to the direct gammarays. Thus, the scattered gamma rays and the direct gamma rays of the object 3 are compared in counting ratio with detectors 1 varied in measuring position thereby enabling the identifying the pollutant A and the radioactive matter B.
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