XRF-Spectrometer; Crono, Bruker Nano GmbH

CSMC

This imaging spectrometer has a variable measuring spot size (0.5, 1 and 2 mm diameter), a camera for sample positioning and for mapping large areas as well as an electrothermally cooled Xflash detector (SDD, area: 50 mm²) with an energy resolution of resolution <140 eV for Mn Kα and an input count rate of up to 500,000 cps. Its movable probe is mounted on a motorized XYZ frame with a maximum scanning range of 600 mm x 450 mm x 75 mm and a maximum speed of up to 42 mm/s. Since the frame is adjustable, scans can be performed in vertical and horizontal position. As for M6 Jetstream, the measurement is performed “on the fly“, i.e., while the probe is moving. Typically, the measurements are made using a 10 W low-power Rh tube, operating at 50 kV and 200 µA, with an acquisition time of 2-150 ms (live time). Contrary to M6 Jetstream which is barely transportable and will require most of the time that the objects to investigate travel to the laboratory of the CSMC, Crono is designed to be transportable, at the expense of a lower spatial resolution (smaller beam size 500 µm vs ~80 µm for M6 Jetstream), and smaller areas which can be scanned in a single measurement. Furthermore, Crono can be used as a single point analyzer together with a normal tripod, which makes it even more mobile. We use this instrument to produce elemental maps of paintings, drawings, and manuscripts in situ.

• General description: XRF-spectrometer; no preparation of the sample required, non-destructive
• Application aim: elemental analysis
• Mobility: mobile
• Equipment specifics:
• X-ray source: air-cooled Rh X-ray tube
• 10-50 kV, 5-200 μA, 10 W
• built-in camera for focusing and positioning
• Electrothermally cooled X-flash detector (SDD, area: 50 mm2) detector
• 65 x 45 cm2 scannable surface

• Application requirements: controlled temperature, 18-25 oC and relative humidity ≤ 80%, safety 
• Sample required: surface to analyse needs to be made flat
• Contact required: no
• Interaction spot dimensions: 500 µm
• Limitations: some maps can be very time-consuming depending on the size and resolution
• Set up time: approx. 10 min, when transported ca. 4 h
• Average time for measuring: depends on the size of the scan, between minutes and hours

• Average time for processing: can vary from a few hours to several days
• Software package: ESPRIT Reveal 
• Output: .HDF5 files
• Contact: Sebastian Bosch, sebastian.bosch"AT"uni-hamburg.de
• Location of the equipment: CSMC Lab (Warburgstr. 28, Hamburg)