title: Surface Dielectric Resonators for X-band EPR Spectroscopy.
abstract: A new resonator for X-band electron paramagnetic resonance (EPR) spectroscopy, which utilizes the unique resonance properties of dielectric substrates, has been developed using a single crystal of titanium dioxide. As a result of the dielectric properties of the crystal(s) chosen, this novel resonator provides the ability to make in vivo EPR spectroscopy surface measurements in the presence of lossy tissues at X-band frequencies (up to 10 GHz). A double-loop coupling device is used to transmit and receive microwave power to/from the resonator. This coupler has been developed and optimized for coupling to the resonator in the presence of lossy tissues to further enable in vivo measurements, such as in vivo EPR spectroscopy of human fingernails or teeth to measure the dose of ionizing radiation that a given individual has been exposed to. An advantage of this resonator for surface measurements is that the magnetic fields generated by the resonator are inherently shallow, which is desirable for in vivo nail dosimetry.
authors.affiliation: Department of Radiology, EPR Center for the Study of Viable Systems, Geisel School of Medicine at Dartmouth, Hanover, NH, USA.
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Petryakov
authors.affiliation: Department of Radiology, EPR Center for the Study of Viable Systems, Geisel School of Medicine at Dartmouth, Hanover, NH, USA wilson.schreiber@dartmouth.edu.
authors.forename: Wilson
authors.initials: W
authors.lastname: Schreiber
authors.affiliation: Department of Radiology, EPR Center for the Study of Viable Systems, Geisel School of Medicine at Dartmouth, Hanover, NH, USA.
authors.forename: Maciej M
authors.initials: MM
authors.lastname: Kmiec
authors.affiliation: Department of Radiology, EPR Center for the Study of Viable Systems, Geisel School of Medicine at Dartmouth, Hanover, NH, USA.|Division of Radiation Oncology, Department of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA.
authors.forename: Benjamin B
authors.initials: BB
authors.lastname: Williams
authors.affiliation: Department of Radiology, EPR Center for the Study of Viable Systems, Geisel School of Medicine at Dartmouth, Hanover, NH, USA.|Division of Radiation Oncology, Department of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA.
authors.forename: Harold M
authors.initials: HM
authors.lastname: Swartz
mesh_terms: D001681:Biological Assay / Q000295:instrumentation*; D017097:Electric Impedance; D004578:Electron Spin Resonance Spectroscopy / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008872:Microwaves; D011874:Radiometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013499:Surface Properties; D014070:Tooth / Q000737:chemistry* / Q000528:radiation effects*; D014159:Transducers