科研之友
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摘要
Occupational exposure to plutonium is generally monitored through analysis of urine samples. Typically, plutonium is separated from the sample and other actinides, and the concentration is determined using alpha spectroscopy. Current methods for separations and analysis are lengthy and require long count times. A new method for monitoring occupational exposure levels of plutonium has been developed, which requires fewer steps and overall less time than the alpha spectroscopy method. In this method, the urine is acidified, and a Pu-239 internal standard is added. The urine is digested in a microwave oven, and plutonium is separated using an EichromTRU Resin column. The plutonium is eluted, and the eluant is injected directly into the Inductively Coupled Plasma-Mass Spectrometer (ICP-MS). Compared to a direct "dilute and shoot" method, a 30-fold improvement in sensitivity is achieved. This method was validated by analyzing several batches of spiked samples. Based on these analyses, a combined standard uncertainty plot, which relates uncertainty to concentration, was produced. The MDA(95) was calculated to be 7.0 x 10(-7) mg L-1, and the Lc(95) was calculated to be 3.5 x 10(-7) mg L-1 for this method.
- 出版日期2017-3
