TXRF Vakuumkammer mit Probenwechsler

01.10.2010 - 30.06.2013
Auftragsforschungsprojekt
This specification for this project defines a Total reflection X ray Fluorescence (TXRF) Vacuum chamber with Sample Changer to be used for determination of trace elements/heavy metals in water also seawater analysis after extraction of the salt matrix/liquid and biomedical samples. The Counterpart laboratory will receive a device .particularly working in the field of ultra trace element analysis. The use of the effect of total reflection of x-rays is the physical basis of the spectrometer using a special high intensive excitation source. This source comprises the high power x-ray source with Mo anode 3kW and a HV power supply. In the next step an efficient multilayer monochromator is used to deliver a high flux of Mo-K-alpha photons. The unit is attached directly to the exit window of the x-ray tube. The chamber houses the sample changer and all units for beam adjustment to achieve the TX conditions. The samples are prepared on specially chosen reflectors either quartz superpolished or a Si wafer by pipetting a volume of several µl and drying them. In any case, what is being prepared for the counterpart laboratory is an efficient cost effective TXRF spectrometer. The samples specified to be analyzed require a Total reflection X ray Fluorescence (TXRF) Vacuum chamber with Sample Changer to be used for determination of trace elements/heavy metals in water and sea water/liquid and biomedical samples at concentration levels of ng/g and guarantee a large sample throughput. The energy dispersive detector is a Silicon drift detector has a thin Be window of 8 um allowing the simultaneous analysis of elements from Na upwards with sufficient efficiency. A multichannelanalyzer stores the spectral data and is designed to control by special software the motion of the sample changer afte each sample has been measured. Quantitative analysis of the multielement samples is performed with special software respecting the excitation conditions and sample type as a thin film.

Personen

Projektleiter_in

Institut

Auftrag/Kooperation

  • CENTRO DE ENERGIA NUCLEAR NA AGRICULTURA

Forschungsschwerpunkte

  • Außerhalb der TUW-Forschungsschwerpunkte: 100%

Schlagwörter

DeutschEnglisch
Röntgenfluoreszenzanalyse X-ray fluorescence Analysis
picogramm Nachweisgrenzenpicogram levels detection limits
automatischer Probenwechslerautomatic sample changer

Publikationen