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Table 2 Setup details of synchrotron beamline ID19 used to scan the fossil samples

From: Synchrotron imaging of dentition provides insights into the biology of Hesperornis and Ichthyornis, the “last” toothed birds

Voxel size (μm) 1.28 3.5
Filters (mm) Diamond 1.4 mm + Al 5.6 mm Diamond 1.4 mm + Al 2 mm + Cu 0.5 mm
Insertion device U17.6 U17.6
Gap (mm) 20 12
Scintillator GGG:Eu 24.6 μm GGG:Eu 47 μm
Refractive lenses N.A. N.A.
average detected energy (keV) 31 53
Machine filling mode 90 mA 16 bunches 200 mA 7/8 + 1 bunch
Propagation distance (mm) 200 250
Number of projections 4998 / 2499 5000
Half-acquisition mode yes / no yes
Exposure time (s) 0.3 0.15
Scan duration (min) 39 25 scans of 28 min each = 700 min
Sample list TMP 1996.12.40 / TMP 1986.30.39 / TMP 1986.42.54 / TMP 1983.103.25 / TMP 1994.31.32 / YPM.1206B / YPM.1460 / YPM.1775 YPM.1206A