A Quick Radioactivity Measuring Instrument for Emergent Nuclear Pollution Detection in Body Of Water

摘要

This manuscript presents a portable Liquid Scintillation (LS) coincidence instrument for quick radioactivity measurement in water, which is based on high speed Analog to Digital Converter (ADC) direct sampling. To meet the requirement of emergent water nuclear accident onsite detection, the instrument is designed to be portable and quick to detect. The LS signal from PMT is sampled by a two-channel 12bit ADC with a speed of 800Msps. Data coincidence calculation is implemented by a chip of Field Programmable Gate Array (FPGA). Test result shows that the instrument can count the total number of pulses of alpha and beta particle radiation while discriminate them satisfactorily. It's significant for quick and efficient onsite detection of environmental radioactive pollution in body of water.