[en] In laboratory tests a method was developed to measure the moisture content of wood fibres countinuous, non contacting and independent of amount of material by absorption of thermal neutrons and gamma rays. As neutron source 300 mCi ²⁴¹Am-Be with 60 mm plexiglass as prethermalisator and as gamma source 300 mCi ²⁴¹Am were used. The neutron detector exists of 3'' O x 2 mm Li-glasszintillator with photomultiplier and preamplifier, the gamma detector of two 22.2 O x 170 mm Geiger-Mueller-tubes. The distance between the sources and the detectors was 160 cm. The results of the tests were a good fitting of the measured values to exponential functions. By mathematical connection of these functions an expression was found which was independent of the amount of material with a constant moisture content and, on the other side, which was a linear function of the moisture content and, on the other side, which was a linear function of the moisture content. A good consistency of the measuring values with these considerations was found. An accuracy of +- 5% moisture content or better can be achieved. (author)