TABLE 1. Neutron radiograph data collection parameters for illustrated specimen (PL1227).
| Scan parameter | Value |
| Total sample dimensions (mm) | 62×58×14 |
| Scintillator composition | ZnS/6LiF |
| Scintillator dimensions (mm) | 100x100x0.05 |
| Rotation angle (°) | 0.25 |
| Total rotation (°) | 180 |
| Projections | 720 |
| No. of frames/projection | 3 |
| Frame exposure (secs) | 60 |
| No. of dark and beam profile images | 6 each |
| Radiograph pixel width (mm) | 0.0161 |
TABLE 2. Resin volume estimates and segmentation thresholds, all values are from visualisations performed with Avizo 9.0.1, volumes based on voxel diameter = 16.1 μm, “max.” and “min.” refer to the software maximum and minimum absolute spectrum values (0 and 65535, respectively), total = coalified plant remains + fossil resin, relative resin volume (%) = (fossil resin / total) × 100.
| Neutron attenuation segmentation thresholds | Volume (no. of voxels) |
Volume (μm3) |
||
| Medium | Lower | Upper | ||
| Air | Min. | 30700 | - | - |
| Matrix | 30700 | 38500 | 1.60×10 | 6.67×1012 |
| Bract-scale complex 1 | ||||
| Coalified plant remains | 38500 | 52250 | 1.59×10 | 6.65×10 |
| Fossil resin | 52250 | Max. | 2.61×10 | 1.09×10 |
| Total | 38500 | Max. | 1.62×10 | 6.76×10 |
| Relative resin volume (%) | 1.61 | |||
| Bract-scale complex 2 | ||||
| Coalified plant remains | 38500 | 52250 | 7.05×10 | 2.94×10 |
| Fossil resin | 52250 | Max. | 6.65×10 | 2.78×10 |
| Total | 38500 | Max. | 7.12×10 | 2.97×10 |
| Relative resin volume (%) | 0.94 | |||
| Bract-scale complex 3 | ||||
| Coalified plant remains | 38500 | 52250 | 1.14×10 | 4.74×10 |
| Fossil resin | 52250 | Max. | 9.98×10 | 4.16×10 |
| Total | 38500 | Max. | 1.15×10 | 4.78×10 |
| Relative resin volume (%) | 0.87 | |||
| Bract-scale complex 4 | ||||
| Coalified cone scale | 38500 | 52250 | 8.49×10 | 3.54×10 |
| Fossil resin | 52250 | Max. | 1.13×10 | 4.73×10 |
| Total | 38500 | Max. | 8.60×10 | 3.59×10 |
| Relative resin volume (%) | 1.32 | |||
