A Mechanism for Producing Magnetic Remanence in Meteorites and Lunar Samples by Cosmic-Ray Exposure

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Science  28 May 1971:
Vol. 172, Issue 3986, pp. 939-941
DOI: 10.1126/science.172.3986.939


An irradiation of 3 x 1017 neutrons per square centimeter in a reactor core produced an increase in the coercive force of iron and kamacite of 16 to 21 percent. The alternating-current demagnetization spectrum of saturation isothermal remanence was shifted toward higher coercive forces. Similar neutron fluences produced by cosmic-ray exposure may be capable of converting soft isothermal remanence in meteorites and lunar samples to remanence with a higher coercive force.