A problem in accurately measuring regional myocardial blood flow by radiation washout techniques is the inability to localize precisely the origin of radiation in tissue. We developed a new approach for in vivo localization and quantification of regional blood flow. A miniature, silicon, solid-state, avalanche radiation detector, which measures the low-penetrating radiation from commonly availa...

Synchrotron Radiation from the Stanford Synchrotron Radiation Laboratory (SSRL) has been used as an excitation source for Total Reflection X-ray Fluorescence Analysis (TXRF) of Na impurities on Si wafer surfaces. A wafer intentionally contaminated by a droplet containing 1.4 x 10 atoms/cm of sodium and a wafer uniformly contaminated with 4.4 x 10 atoms/cm of Na were investigated. The minimum de...

Terahertz photovoltaic detection of cyclotron resonance in the regime of radiation-induced magnetoresistance oscillations Report Title We examine and compare the diagonal magnetoresistance, R-xx, and the photovoltage induced by microwave (42 <= f <= 300 GHz) and terahertz (f >= 300 GHz) photoexcitation in the high mobility quasi-two-dimensional GaAs/AlGaAs system. The data demonstrate strong ra...

Total reflection X-ray fluorescence analysis (TXRF) using monochromatized undulator radiation in the PTB radiometry laboratory at the synchrotron radiation facility BESSY II has been employed to investigate the chemical state of nitrogen compounds in aerosols. The aerosol samples of different size fractions were deposited on silicon wafer surfaces in a May impactor. Using a thin window Si(Li) d...