Gamma ray attenuation (GRA) data were acquired using a Cs-137 collimated source and a sodium iodide (thallium), or NaI(Tl), scintillation detector. The signal was calibrated using water and aluminum s
Method A: wet-bulk volume measured with special volume sampler; method B: wet-bulk volume measured by gas pycnometry; method C: dry volume measured by gas pycnometry
