Berlin 2001 – wissenschaftliches Programm
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MS: Massenspektrometrie
MS 3: Laser Resonance Ionization Mass Spectrometry
MS 3.1: Gruppenbericht
Dienstag, 3. April 2001, 15:45–16:15, EB 202
RIMS for Routine Ultratrace Analysis of Plutonium — •C. Grüning1, G. Huber2, J.-V. Kratz1, P. Kunz2, J. Lassen2, G. Passler2, N. Trautmann1, A. Waldek1, and K. Wendt2 — 1Institut für Kernchemie, Universität Mainz, Fritz-Strassmann-Weg 2, 55128 Mainz — 2Institut für Physik, Universität Mainz, Staudingerweg 7, 55128 Mainz
Resonance ionization mass spectrometry (RIMS) is a very sensitive and highly selective method for ultratrace analysis of long-lived radioactive isotopes in environmental, biological and technical samples.
Until very recently the application of RIMS for routine analysis has been limited due to the complexity of the apparatus. For the analysis of plutonium, a pulsed RIMS apparatus has been developed with a powerful, reliable and easy to handle Nd:YAG pumped titanium-sapphire laser system combined with a time-of-flight mass spectrometer.
Spectroscopic measurements yielded an efficient three step excitation scheme with λ 1 = 420,76 nm, λ 2 = 847,28 nm and λ 3 = 767,53 nm and subsequent electric field ionization for ultratrace analysis of plutonium. The total efficiency of the RIMS apparatus of 1· 10−5 results in an overall detection limit of < 107 atoms of plutonium. The applicability and reliability of this system could be demonstrated in measurements of plutonium in a large number of dust, sea water und urine samples.
To further facilitate trace detection of plutonium, a compact and inexpensive RIMS apparatus with diode lasers and a quadrupole mass spectrometer has been assembled and tested.
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