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Figure 1.- Correct sensor position: (a) Needle on whole-round section, (b) Puck on section-half.
B) Hard-Rock Samples
Place hard rock samples in an ambient temperature seawater bath to equilibrate and saturate (4–12 hr). Keep sample saturated until measurement. A bell jar/vacuum pump can aid in saturation.
NOTE: Seawater bath is not necessary when using the mini-puck.
- If the surface of the split core is excessively rough, use a lap plate and grit from the Thin Section Lab to prepare a smooth surface on a split-core piece. Pieces must be at least 10 cm long.
- Equilibrate the sample and sensor together in an insulated seawater bath for at least 15 min prior to measurement. NOTE: Do not submerge the puck – let the water level rise to half the depth of the puck or less.
- Secure the puck to the sample with velcro or a rubber band (Figure 2).
- Optional - Apply thermal joint compound to the side of the probe where the line source is located.
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