The XRF facility is located at IODP in the Texas A&M University Research Park (see map).
A third-generation AvaaTech (www.avaatech.com) XRF core scanner is located in the ODASES lab at 1000 Discovery Drive. The scanner provides non-destructive elemental identification from the surface of core section halves (or U-channels).
Range of elements:
Aluminum (Al) through uranium (U).
This instrument in designed to measure core section halves or slabs (e.g., "U-channels") with flat surfaces.
- Length: 30~160 cm
- Width: 5~13 cm.
Detection Limits for some Elements
Muddy sediment measured at 10kV, no filter, and at 20-second count time (AavaTech User Guide):
A dual slit system provides variable spatial resolution with the following ranges:
- Irradiation sample length: 0.1~10 mm ("downcore" or axis of motion)
- Irradiation sample width: 2~15 mm ("crosscore")
- Multichannel analyzer, 2048 channels at 20 eV/channel
- FWHM at 5.9 keV better than 190 eV
- Throughput depends on the measurement spacing, number of runs at different source energies, and counting times. These parameters are discussed further below.
- As a rule of thumb, typical sediment analyses projects measure 2 to 8 core section halves per 24-h period.