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Low-energy gamma ray attenuation characteristics of aviation fuelsAm241 (59.5 keV) gamma ray attenuation characteristics were investigated in 270 aviation fuel (Jet A and Jet A-1) samples from 76 airports around the world as a part of world wide study to measure the variability of aviation fuel properties as a function of season and geographical origin. All measurements were made at room temperature which varied from 20 to 27 C. Fuel densities (rho) were measured concurrently with their linear attenuation coefficients (mu), thus providing a measure of mass attenuation coefficient (mu/rho) for the test samples. In 43 fuel samples, rho and mu values were measured at more than one room temperature, thus providing mu/rho values for them at several temperatures. The results were found to be independent of the temperature at which mu and rho values were measured. It is noted that whereas the individual mu and rho values vary considerably from airport to airport as well as season to season, the mu/rho values for all samples are constant at 0.1843 + or - 0.0013 cu cm/gm. This constancy of mu/rho value for aviation fuels is significant since a nuclear fuel quantity gauging system based on low energy gamma ray attenuation will be viable throughout the world.
Document ID
19900009566
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Singh, Jag J. (NASA Langley Research Center Hampton, VA., United States)
Shen, Chih-Ping (Old Dominion Univ. Norfolk, VA., United States)
Sprinkle, Danny R. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1990
Subject Category
Computer Programming And Software
Report/Patent Number
L-16719
NAS 1.60:2974
NASA-TP-2974
Accession Number
90N18882
Funding Number(s)
PROJECT: RTOP 141-20-10-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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