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The scattered-energy spectra of monochronized synchrotron-radiation photons toward 90 by C, Al, Fe, Cu, Au, and Pb samples were measured using high-purity Ge detectors to obtain incoherent scattering function (S) in the 1.14 & x & 2.28-A region. The multiple-scattering intensity was evaluated by a Monte Carlo calculation while considering the Doppler broadening of the Comptonscattered photons and the photon linear polarization. The measured S of C, Al, Fe, and Cu agreed with that based on the Wailer-Hartree theory (S), as well as that based on a relativistic impulse approximation (S) within the experiment error (2.5' %%uo). The measured S of high-Z atoms (Au and Pb) agrees with S aud is smaller than S by 3-6'%%uo.

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Our results showed the dosimetric properties of the RGD, including the energy dependence of the dose response, reproducibly, variation, and angular dependence in low-energy photons and suggest that the accuracy of the absorbed dose in low-energy photons is affected by the readout method and the distribution of radiophotoluminescence centers in the RGD.