Comparison of Continuous Wave and Rapid Scan X-band Electron Paramagnetic Resonance of Irradiated Clipped Fingernails. Issue 1 (23rd December 2016)

• Record Type: Journal Article
• Authors: Elajaili, Hanan; McPeak, Joseph; Romanyukha, Alexander; Aggarwal, Priyanka; Eaton, Sandra S.; Eaton, Gareth R.
• Is Part Of: Radiation protection dosimetry. Volume 172:Issue 1/3(2016)
• Page Start: 133
• Page End: 138
• Publication Date: 2016-12-23
• Subjects: Radiation dosimetry -- Periodicals; Radiation -- Safety measures -- Periodicals; 363.1799
• DOI: 10.1093/rpd/ncw162
• Languages: English
• ISSNs: 0144-8420

Abstract

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 B 1 = 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 B 1 of 2.3 μT or 90 for a modulation amplitude of 0.4 mT and B 1 of 3.2 μT, which resulted in standard deviations of replicate measurements of 5% or 2%, respectively.