LASER-INDUCED PHOTOACOUSTIC-SPECTROSCOPY FOR ANALYSIS OF NEPTUNIUM(V)IONS UNDER PUREX PROCESS CONDITION

A laser induced photoacoustic spectroscopy (LIPAS) system has been stu died to analyze penta-valent (NpO2+) neptunium under PUREX process con dition. The detection limit absorptivity of Np(V) in nitric acid is fo und to be 3.41x10(-5) cm(-1) which is two orders lower than that of co nventional absorption spectrophotometry. The intensity of the photoaco ustic signal is magnified in proportion to tile coexisting uranium con centration. Signals of Np(V) ions in the presence of uranium agree wel l with signals of Np(V) without uranium when multiplying by the specif ic heat of the solutions containing uranium. The photoacoustic spectra are measured by a double-cell system.