Compensated gamma-gamma density sonde using three detectors

Details Compensated gamma-gamma density sonde using three detectors Compensated gamma-gamma density sonde using three detectors

1993-05-10

1995-02-14

Hayes, Gail O.

Boots, shoes, and leggings

250266, 2502693, 73151, 73153, G06F 1520

Patent

active

053901150

ABSTRACT:
A gamma-gamma sonde for use in determining the bulk density of an earth formation adjacent a borehole comprises a source of gamma radiation and three attenuation-type gamma ray detectors DN, DI and DF spaced apart from the source, respectively, at successively greater distances. The count rate of each detector is converted into an apparent formation density .rho. based on data derived from calibration of the sonde in calibration media having known uniform density, thereby to obtain apparent formation densities .rho..sub.F, .rho..sub.I and .rho..sub.N. The ratio

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