High Sensitivity On-Line Monitor for Radioactive Effluent

摘要

A new approach for a highly sensitive effluent monitor is presented. The free flow type monitor, which consists of a straightener, nozzle, monitoring section and γ-ray detector, is demonstrated to be effective in providing long term stability.The 160 start-and-stop cycles of effluent discharge were repeated in a 120-h testing period. Results showed a background increase was not observed for the free flow type monitor. The background count rate was calibrated to the lowest detection limit to be 2.2 X 10-2 Bq/ml for a 300 s measurement time.