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A new resonator for X-band  in vivo  EPR nail dosimetry, the dielectric-backed aperture resonator (DAR), is developed based on rectangular TE 102  geometry. This novel geometry for surface spectroscopy improves at least a factor of 20 compared to a traditional non-backed aperture resonator. Such an increase in EPR sensitivity is achieved by using a non-resonant dielectric slab, placed on the aperture inside the cavity. The dielectric slab provides an increased magnetic field at the aperture and sample, while minimizing sensitive aperture resonance conditions. This work also introduces a DAR semi-spherical (SS)-TE 011  geometry. The SS-TE 011  geometry is attractive due to having twice the incident magnetic field at the aperture for a fixed input power. It has been shown that DAR provides sufficient sensitivity to make biologically relevant measurements both  in vitro  and  in vivo . Although  in vivo  tests have shown some effects of physiological motions that suggest the necessity of a more robust finger holder, equivalent dosimetry sensitivity of approximately 1.4 Gy has been demonstrated.

Dielectric-Backed Aperture Resonators for X-Band in vivo EPR Nail Dosimetry