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P034 Z-99 MOBILE INSTRUMENT FOR NMR MEASURE- Introduction 1 MENTS ON SAMPLES IN THE EARTH’S MAGNETIC FIELD TINO RADI� Radic Research Zehntwerderweg 188A 13469 Berlin Germany E-mail: [email protected] Web: www.radic-research.de The Nuclear Magnetic Resonance (NMR) method (Abragam 1983) allows beside other parameters a non-destructive measurement of the water content and the pore radii distribution of a rock sample. Therefore it is not surprising that the NMR method has developed into an important geophysical instrument. But up to now the main application area is still the laboratory. Unfortunately samples show many unwanted modifications on their way from the field to the