الفهرس 
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Abstract
Ultraviolet radiation has many applications. It used in medicine, industry, business, research, domestic and cosmetic purposes. UV radiometers are devices used to measure the power of this radiation. To assure the accuracy of measurement these instruments has to be well characterized and the calibration procedure has to be designed to meet the growing precision and accuracy requirements
Radiometry laboratory at the National Institute of Standards (NIS), aims through this thesis to establish the national standard system for calibrating the ultraviolet radiometers.
This thesis consists of four chapters. Chapter one display an introduction and the previous researches on the subject of the calibration of UV radiometer. In addition to, clarify the aim of this study.
In chapter two the theoretical concepts were introduced through highlighting on radiometric aspects. Such as radiometric and photometric quantities and the measurement uncertainty.
The apparatuses and experimental methods used in establishing the standard calibration system was presents in chapter three. It shows the optical detectors, light sources and radiometric traceability chain. Also, the equipment description and the methods used in characterizing the UV source, UV filters and UV detectors. This were executed by examined the spectral power distributions, uniformity, and stability of three ultraviolet sources (Deuterium lamp, Mercury arc lamp and Quartz Halogen Tungsten QTH lamp) to find the most suitable one to be used in the calibration system. Also, the spectral transmittance and spatial uniformity of three ultraviolet filters is studied to select the appropriate one for the calibration system. In addition to, investigate the spectral responsivity, spatial uniformity and the linearity of response of the UV detector. The calibration method was carried out and the uncertainty was calculated. Finally, the quality assurance of the results carried out to ensure the quality of the calibration system.
Chapter four devoted for the discussion of the results obtained in this work. Results show that the mercury arc lamp is the most suitable source for the calibration system of UVA radiometer. Due to it is emitting about 30 % UV radiation and it is the spectrum have very strong peak at 365 nm. The narrow band interference filter is the proper filter used in the calibration system. Because it transmitted about 61 % from incident radiation. The UVA detector with 45 nm full width at half maximum peaked at 362 nm was compared to the national reference detector for carrying out the calibration. Therefore, the traceability chain was traceable to the cryogenic primary standard through the national reference detector. The overall expanded uncertainty of the measurements was about 1.96 % at k = 2. The quality control charts used to ensure the quality assurance of the results show that precision and accuracy values are acceptable. This means that the calibration system was applicable and accurate.