Journal
APPLIED MAGNETIC RESONANCE
Volume 19, Issue 2, Pages 255-269Publisher
SPRINGER WIEN
DOI: 10.1007/BF03162280
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A practical method of calibrating intensities of ESR signals with a single crystal of copper pentahydrate (CuSO4. 5H(2)O) has been developed for calcitic shells containing a large amount of manganese (Mn2+). A sample holder is designed to insert the crystal from the bottom of the cavity for use as a standard sample. The signal of Cu2+ in the standard does not interfere with the Mn2+ signals. The Cu2+ signal and dating signal of the shell are recorded simultaneously: the ratio of their intensities is the basis for calibration. It is shown that this calibration method reduces the errors attributed to both coupling and unloaded Q factors of the cavity resonator to within 2%.
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