Lab Exercise - Determination of Uranium Concentration and the 234U 238U Isotopic Ratio in a Solution
Laboratory of Radiochemistry
Department of Chemistry
University of Helsinki
Here the learning goals and purpose of the exercise should be presented in a reasonable way.
Isotopic Ratio of Natural Uranium (read)
The purpose of the work is to determine the activities of 238U and 234U in a water sample and calculate the 234U/238U activity ratio. The sample solution has been obtained by dissolution of uranophane mineral (Ca[(UO2)SiO3(OH)]2×6H2O]) originating from Zaire. First, the 233U tracer is added to an aliquot of the stock solution and the solution is evaporated to dryness. After dissolution into 9 M HCl interfering radionuclides are separated by anion exchange chromatography. Finally, a uranium alpha counting source is prepared by CeF3 coprecipitation and the uranium alpha spectrum is measured by alpha spectrometry.
Performance of the work
Questions for the Students
Describe in detail the whole separation procedure and explain why each step was made. Draw a separation procedure scheme.
Draw the alpha spectrum and identify all uranium peaks.
Calculate the chemical yield of U separation.
Calculate the activity concentrations of 234U and 238U and their uncertainties. Calculate the 234U/238U ratio and its uncertainty.
Here the safety aspects of the exercises should be written. Because of the different rules in different countries this will probably never be correct for every user. It should at least contain HMDS for the chemical compounds used or relevant links to used equipment.
Description of the equipment needed and used during the exercises.
The preparation that the lab Supervisor needs to do to ready the lab.
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