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Trace Detection by Pulse Laser

#0616


Trace Amount Lanthanide and Actinide Detection in Environmental Samples by Pulse Laser Radiation

Tech Area / Field

  • ENV-MIN/Monitoring and Instrumentation/Environment

Status
8 Project completed

Registration date
08.04.1996

Completion date
26.10.2001

Senior Project Manager
Ryabeva E V

Leading Institute
Khlopin Radium Institute, Russia, St Petersburg

Collaborators

  • Lawrence Livermore National Laboratory, USA, CA, Livermore\nInstitut für Radiochemie, Germany, Dresden

Project summary

The main goal of this Project is the measurement of elements and isotopes concentration by laser spectroscopy methods. A special attention will be given to Time Resolved Laser Induced Fluorescence (TRLIF) method and to speciation of U, Cm, Pu in liquid system. We plan to improve the sensitivity of TRLIF, to study the possibility of TRLIF in isotope analysis, carry out the element analysis of environmental samples by TRILF.

Technical Approach and methodology

The recent state of experimental technique and data processing allows to carry out the element and isotope analysis of different samples. The main sources of experimental errors of laser spectroscopy methods are connected with background conditions. To minimize these errors we plan to do the following:


1. Use the cuvette of a special form.
2. Use the most convenient polarization of the laser radiation.
3. Use the optimal scheme of light collection.
4. Study the dependence of signal/background ratio on delay and gate times in different solutions. From these data we will choose the optimal experimental conditions.
5. Carry out the full statistical analysis of the data.
6. Accumulate and store all experimental data. Organize the structure data bank provided with necessary service codes.

Expected Results


l. Trace amount determinations of U, Cm, Sm, Eu, Gd, Tb in solutions of environmental samples with sensitivity up to 5ґ10-13 mol/l (or 10+7 nuclei per cubic cm).
2. Development of TRLIF method for Pu determination
3. Increase sensitivity of TRLIF method and study the possibility of TRLIF use for isotope analyses.

Potential role of foreign collaborators

Major foreign laboratories, such as Lawrence Livermore National Laboratory, Los Alamos National Laboratory and Argorme National Laboratory in USA, Japan Atomic Energy Research Institute in Japan and many others study high resolution laser spectrometry as powerful tool in environmental and earth sciences, and at the same time lead many practical projects in environmental assay of transuranics, decommissioning of old nuclear industry sites and rehabilitation of territories, contaminated by plutonium and by other transuranics. Khlopin Radium Institute already has working contacts with these laboratories and takes part in some of this work. We share results of our research with these laboratories, and to develop implementation of our methods in the field.

Foreign collaborators would visit our laboratory, discuss results, receive first-hand information of latest developments and, if necessary, jointly develop suitable applications. We also hope to use their advice, direct our investigations in suggested ways, and to present results obtained at their laboratories for discussion and use.


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