Zinc sulfide coated scintillation cells are the primary method for measuring radon-222 at the U.S. Environmental Protection Agency (EPA), Office of Radiation Programs (ORP), Eastern Environmental Radiation Facility (EERF). These cells are used to measure concentrations of radon in exposure chambers that are used to calibrate or test other devices or instruments. Individual cells are calibrated ...

Title of Dissertation: IRT VS. FACTOR ANALYSIS APPROACHES IN ANALYZING MULTIGROUP MULTIDIMENSIONAL BINARY DATA: THE EFFECT OF STRUCTURAL ORTHOGONALITY, AND THE EQUIVALENCE IN TEST STRUCTURE, ITEM DIFFICULTY, & EXAMINEE GROUPS Peng Lin, Doctor of Philosophy, 2008 Directed By: Professor Robert W. Lissitz Department of Measurement, Statistics and Evaluation The purpose of this study was to investi...

1. Introduction This paper presents a new methodology for realizing a Rice channel in BAN Over-The-Air (OTA) testing using a fading emulator with a dynamic phantom. For the proposed apparatus to be effectual, the fading emulator must be provided with an appropriate K-factor that represents the actual propagation environment indoors. Further, an implementation of the Rice channel to the proposed...

The radiometric calibration for the reflective solar bands (RSB) of the Visible Infrared Imaging Radiometer Suite (VIIRS) on board the Suomi National Polar-orbiting Partnership (SNPP) platform has reached a mature stage after four years since its launch. The characterization of the vignetting effect of the attenuation screens, the bidirectional reflectance factor of the solar diffuser, the degr...

A synthetic aperture radar (SAR) system requires external absolute calibration so that radiometric measurements can be exploited in numerous scientific and commercial applications. Besides estimating a calibration factor, metrological standards also demand the derivation of a respective calibration uncertainty. This uncertainty is currently not systematically determined. Here for the first time...

Direct georeferencing is increasingly applied in connection of the photogrammetric film cameras. The prerequisite for the use of this technique is an airborne system calibration. The calibration issue was investigated by analysing 10 calibration blocks obtained with four GPS/IMU/optics-combinations. The earlier studies already showed that in-flight interior orientation determination was highly ...

The ability to accurately determine the amount of structural life that has been consumed in military aircraft can be compromised by the inability to be consistent in the manufacture and installation of strain sensors and general aircraft-to-aircraft variations in the structures themselves. The variations must be accounted for in order to be able to make correct decisions regarding the ability t...

Calibration of the effective area (Aeff) for the Rosetta-Alice instrument requires observation of calibration stars with known FUV spectra. A number of calibration stars have been selected and observed for this purpose, and will continue to be observed in future mission phases. Calibrated spectra of the same stars from past and current FUV missions constitute the known spectra against which R-A...

the applicability of hollow fiber-based liquid phase microextraction (hf-lpme) was evaluated for the extraction and preconcentration of loratadine prior to determination by hplc. in order to obtain high extraction recovery, the parameters affecting the hf-lpme including type of organic phase, ph of the source and receiving phases, stirring rate, extraction time and salt addition were studied an...