干旱区生态环境知识资源中心(Arid): Near-surface moisture and biomass influences on the reliability of aerial radiometric surveys as a measure of natural radioelement concentrations

Arid

DOI	10.2172/5324651
报告编号	GJBX-136(80)
来源ID	OSTI_ID: 5324651
	Near-surface moisture and biomass influences on the reliability of aerial radiometric surveys as a measure of natural radioelement concentrations
	Norwine, J.R.; Hansen, D.J.; Saunders, D.F.; Galbraith, J.H.
英文摘要	Significant differences in aerial radiometric system calibration constants in humid-forested (Portland quadrangle) and desert (Lake Mead test strip) regions indicated the probability of substantial gamma-ray absorption by soil moisture in humid areas. A set of test quadrangles was selected to investigate relationships among a group of environmental variables and ratios of whole-quadrangle mean (X) stream sediment uranium (U) and thorium (Th) contents to corresponding mean aerial radiometric uranium and thorium measurements. It was assumed that stream sediment values might be sufficiently representative of the average surface radioelement concentrations to be used in ground-calibrating the aerial systems. Preliminary testing established strong statistical correlations between the radioelement ratios and moisture and biomass variables. However, it is recognized that moisture and biomass relationships represent a variety of variables affecting the aerial gamma-ray measurements, such as soil formation, including weathering effects. Also, the data suggested that in certain very humid areas placering effects caused the mean thorium and uranium content of stream sediments to be much greater than actual concentrations in the average surface rocks. These effects appeared to be minimal in the arid regions, where the stream sediment data were more representative of the surface materials in general. These observations prompted a follow-up study using surface-to-aerial ratios based on analyses of surface samples in humid regions and including the stream sediment-to-aerial data ratios only for the relatively arid areas. Multiple linear regression analyses of the data indicated two-variable models would provide reasonable correction factors for aerial data obtained in humid environments.
出版年	1979
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS ; RADIOMETRIC SURVEYS ; CORRECTIONS ; RELIABILITY ; AERIAL PROSPECTING ; BIOMASS ; MOISTURE ; URANIUM DEPOSITS ; USA ; ENERGY SOURCES ; GEOLOGIC DEPOSITS ; GEOPHYSICAL SURVEYS ; NORTH AMERICA ; PROSPECTING ; RENEWABLE ENERGY SOURCES ; RESOURCES ; SURVEYS 050200* -- Nuclear Fuels-- Exploration-- (-1987)
URL	http://www.osti.gov/scitech/servlets/purl/5324651
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/262473
推荐引用方式 GB/T 7714	Norwine, J.R.,Hansen, D.J.,Saunders, D.F.,et al. Near-surface moisture and biomass influences on the reliability of aerial radiometric surveys as a measure of natural radioelement concentrations,1979.