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- W2039451584 abstract "During the past decade thermal neutron fluence determination with metal activation monitors has gradually become discredited by geochronologists applying the fission-track method. The opinion that the calculated fluences were not accurate was sustained by the fact that the few calibration experiments including more than one metal monitor often yielded inconsistent results. In this work 14 irradiations have been carried out calibrated with Cu and Au monitors while in 10 of them also a Cc monitor was included. The thermal neutron fluences registered by the Cc and Au monitors are very consistent, diverging 1.4% on the average, and 3.3% at the most. The Cu measurements are less consistent yielding fluences that are systematically ∼8.5% lower than those obtained with Au. The difference is ascribed to possible inaccuracies in the nuclear parameters of Cu and to problems inherent to the measurement of the 511-keV annihilation radiation of 64Cu. The good agreement between the Au and Cc measurements in our opinion sustains the accuracy of the fluence determinations with these monitors. A fission-track analysis with the population method of two apatite reference samples (Fish Canyon tuff and Durango) with the use of combined Au and Cc fluence determination clearly supports a nominal value of 8.5·10−17 a−1 for γf Based on the above results some suggestions are made for a standardization of calibration procedures relying on the determination of the absolute thermal neutron fluence." @default.
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- W2039451584 date "1988-10-01" @default.
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- W2039451584 title "Thermal neutron fluence determination for fission-track dating with metal activation monitors: A re-investigation" @default.
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- W2039451584 doi "https://doi.org/10.1016/0168-9622(88)90004-8" @default.
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