NEW! 1024 channel
Natural Gamma Spectroscopy Probe
The natural gamma spectroscopy
probe analyses the energy spectrum of gamma radiation
from naturally occurring or man-made isotopes in
the formation surrounding a borehole. The probe
normally operates in ‘fixed window’ mode,
using five preset energy windows to determine concentrations
of the main natural emitters, potassium, uranium
and thorium as continuous measurements. The tool
may be paused at any depth during logging to capture
a full 1024-channel
spectrum. The probe is internally compensated for
temperature variations in the borehole.
PRINCIPLE OF MEASUREMENT
Gamma
photons produced by decay of naturally occurring
potassium, uranium, thorium
and/or unstable man-made isotopes in the formation
strike are detected by a large-volume gamma scintillation
counter and converted to electrical pulses. The
amplitude of the pulses depends on the photon energy.
An analyser within the probe separates the pulses
into separate channels according to their amplitudes.
Count-rates from groups of channels are converted
in real-time by the surface software to concentrations
of the originating elements using preset algorithms.
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