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  • Title: Comparison of Continuous Wave and Rapid Scan X-band Electron Paramagnetic Resonance of Irradiated Clipped Fingernails.
    Author: Elajaili H, McPeak J, Romanyukha A, Aggarwal P, Eaton SS, Eaton GR.
    Journal: Radiat Prot Dosimetry; 2016 Dec; 172(1-3):133-138. PubMed ID: 27590467.
    Abstract:
    X-band rapid scan electron paramagnetic resonance (EPR) measures the free radicals in irradiated clipped fingernails with higher signal-to-noise (S/N) and lower standard deviation of the signal amplitude for replicate measurements than does conventional continuous wave (CW) EPR in the same measurement time. For a clipped fingernail sample irradiated to 10 Gy and data acquisition time of 30 s with B1 = 8.5 μT, the S/N for rapid scan is >2000 for the absorption spectrum and 1200 for the corresponding first derivative. The standard deviation for replicate measurements of signal amplitude is ~1%. For CW spectra, the S/N depends on the modulation amplitude. The CW signal has a first derivative peak-to-peak linewidth of 0.95 mT. For 30 s of CW acquisition time, the S/N was 30 for a conservative modulation amplitude of 0.2 mT and B1 of 2.3 μT or 90 for a modulation amplitude of 0.4 mT and B1 of 3.2 μT, which resulted in standard deviations of replicate measurements of 5% or 2%, respectively.
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