NON CONTACT TYPE SURFACE POLLUTION DENSITY INSPECTOR

摘要

PURPOSE:To obtain a non contact type surface pollution density inspector which has a detection part adapted to measure a pollution density accurately and a signal processing part in a high radiation environment field. CONSTITUTION:gamma-rays 11 and beta-rays 12 emitted from a surface pollutant 10 are incident on radiation detecting sections 1 and 2 to generate electric pulses. The electric signals are amplified with amplifiers 4 and 5. noise components are removed with discriminators 6 and 7 and then, the electric signal alone attributed to the beta-rays 12 is extracted with an anti-coincidence circuit 8. The results are inputted to display a radiation unit a display section 13.