Measurement Uncertainties and Minimum Detectable Concentrations for the In Situ Nal Gamma Spectroscopy Systems Used at Fernald.

Technical Information Center Oak Ridge Tennessee

关键词: Soil pollution;    Sodium iodides;    Uranium;    Radionuclides;    Gamma spectroscopy;   

RP-ID  :  DE2004828775

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

This report determines the uncertainties associated with measurements made by using the mobile gamma-ray spectrometers deployed at the U.S. Department of Energy's Fernald Closure Project to characterize soil contaminated with (sup 238)U, (sup 226)Ra, and (sup 232)Th. It also examines minimum detectable concentrations (MDCs) for these instruments. The spectrometers use sodium iodide (NaI) detectors and are mounted on a variety of platforms that allow access to all areas of the site, including deep excavations. They are utilized for surveying large areas to obtain distribution patterns for radionuclides in soil, determining whether activity concentrations exceed action levels for hot spots, and determining if the concentration of total uranium exceeds the allowable level for Fernald's on-site disposal facility.