A biodosimeter based on thermal-induced elastic shear wave (TIESW) in silicone acellular porcine dermis (SAPD) at thermal steady state has been proposed and demonstrated. A square slab SAPD treated with ionizing radiation was tested. The SAPD becomes a continuous homogeneous and isotropic viscoelastic medium due to the generation of randomly coiled collagen fibers formed from their bundle-like structure in the dermis. A harmonic TIESW then propagates on the surface of the SAPD as measured by a nanometer-scaled strain-stress response under thermal equilibrium conditions at room temperature. TIESW oscillation frequency was noninvasively measured in real time by monitoring the transverse displacement of the TIESW on the SAPD surface. Because the elastic shear modulus is highly sensitive to absorbed doses of ionizing radiation, this proposed biodosimeter can become a highly sensitive and noninvasive method for quantitatively determining tissue-absorbed dosage in terms of TIESW’s oscillation frequency. Detection sensitivity at 1 cGy and dynamic ranges covering 1 to 40 cGy and 80 to 500 cGy were demonstrated.

A novel polarization shifting interferomefer is proposed. The measuremenf of the linear birefiingenf parameters of a waveplafe in hvo dimensional distribution is demonsfrofed experimentally.Phase retarder plate (PRP) such as quarter wave plate (QWP) is one of the most important optical components in the polarized interferometric systems. The performance of PRP is very crucial to many applications [I ,2]. Therefore, precisely determine the linear birefringent parameters (the phase retardation and the azimuth angle) of PRP is required. There are various methods dedicate to this purpose [3,4]. In particular, two dimensional (2-D) distribution of linear birefringent parameters are essential to analysis the stress induced birefringence in laser rod[5] and fiber optics [6]. In this report, a polarization shifting interferometer associates with optical heterodyne differential detection is proposed that the linear birefringent parameters of QWP in 2-D distribution are determined.

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