Development of applied optical techniques

This report resents the status of researches on the applications of lasers at KAERI. A compact portable laser fluorometer detecting uranium desolved in aqueous solution was built. The laser-induced fluorescence of uranium was detected with a photomultiplier tube. A delayed gate circuit and an integrating circuit were used to process the electrical signal. A small nitrogen laser was used to excite uranium. The detecting limit is about 0.1 ppb. The effect of various acidic solutions was investigated. Standard addition technique was incorporated to improve the measuring accuracy. This instrument can be used for safety inspection of workers in the nuclear fuel cycle facilities. (Author)