We demonstrated that a high-resolution liquid-filled ion-chamber-array can be suitable for robotic radiosurgery delivery-quality-assurance and that small errors can be detected with tight distance-to-agreement criterion. Further improvement may come from beam specific correction for incidence angle and source-detector-distance response.

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The optical properties of dense plasmas in the extreme ultraviolet spectral range are investigated experimentally and theoretically. A method is presented that enables measurement of electron densities in excess of 10 24 cm Ϫ3 . High-order harmonics are transmitted through a femtosecond-laser-produced plasma probing the optical density at several wavelengths. This technique has the advantage of providing direct access to ultrahigh electron densities, and achieves a precision of about 20% at zero time delay. The dielectric function of a dense carbon plasma was calculated including effects of higher density and the contribution of bound electrons.

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