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Title: Comparison of beta-ray and gamma-ray transmission methods for measurement of frost density distribution
Authors: Bong, T.Y. 
Wijeysundera, N.E. 
Saw, E.L. 
Lau, K.O.
Keywords: beta-ray transmission
frost formation
gamma-ray transmission
measurement technique
radiation attenuation
Issue Date: Sep-1991
Citation: Bong, T.Y.,Wijeysundera, N.E.,Saw, E.L.,Lau, K.O. (1991-09). Comparison of beta-ray and gamma-ray transmission methods for measurement of frost density distribution. Experimental Thermal and Fluid Science 4 (5) : 567-576. ScholarBank@NUS Repository.
Abstract: The application of beta-ray and gamma-ray transmission methods for the measurement of the frost density distribution on a vertical pipe is reported. The beta-ray source used is strontium-90; gamma rays are produced by the decay of americium-241. The frost is formed by free convection of moist air. The average density computed from radiation attenuation data is compared with measurements using a coring tool. The attenuation versus mass thickness curve for gamma rays is linear on a semilog plot, while for beta rays there is some scatter in the data. The low attenuation of the gamma rays by the annular frost layer causes large uncertainties of about 20-50% in the computed average density. For beta rays the uncertainty is less than about 20%, mainly because of the high attenuation. The uncertainty in the computed local density distribution for the beta-ray method varies from a few percent at the frost surface to about 30% near the tube wall. © 1991.
Source Title: Experimental Thermal and Fluid Science
ISSN: 08941777
Appears in Collections:Staff Publications

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