Preparation of electrodeless discharge lamps for emission studies of uranium isotopes at trace level

摘要

A simplified method for preparation of electrodeless discharge lamp for uranium isotopes with specific concerns for ~(232)U is described. Micro-gram quantities of solid uranium oxides and aqueous solution of uranium nitrate have been used as a starting material for in situ synthesis of uranium tetraiodide. High temperature iodination reaction is carried out in the presence of inert gas neon. By careful design, the preparation time and surface area of quartz reaction tubes have been reduced considerably. The latter decreases the level of contamination which has a direct bearing on the operational lifetime of the lamps. Incorporation of steps to purify the product from an unwanted material improved the stability of the lamps. The procedure provides a safe and convenient way of handling ~(232)U in particular but can be extended in general to any actinides having radioactivity similar to that of freshly separated ~(232)U. Characteristic emission of uranium isotopes have been recorded by Fourier Transform Spectrometer to show the satisfactory operation of the lamps as well as their usage for studying emission spectra of the specific isotope.