Geoscience Reference
In-Depth Information
11
Figure 11.1 Some examples of
the recording of numerical data in
a fi eld notebook. (a) Gamma-ray
spectrometer data from fi ve sample
points (stations), showing
stratigraphic position, raw and
processed data and electronic fi le
reference (pos). In this case
gamma-ray spectrometer readings
were taken every 30 cm (i.e. every
third station, in order to match with
the resolution of the instrument;
other readings were taken every
10 cm). (b) Magnetic susceptibility
data every 2.5 cm (whole-number
stations are every 10 cm),
background readings in air and
two readings on the rock. This
instrument measures continuously
and integrates the data to provide
a reading every 10 seconds. The
small black circles represent
readings given by the instrument as
it is moved from rock to air. The
recording of this as a point ensures
that there is no mistake made
between these meaningless
measurements and the data
required. (Notebooks of Angela L.
Coe, The Open University, UK.)
(a)
(b)
When collecting numerical data using an instrument consider:
devising a systematic method so that you do not miss
anything;
whether the resolution of the data is appropriate for the aim
of the fi eldwork but also the limitations of the instrument;
the most appropriate way to use the instrument depending
on where the instrument obtains most of its signal from.
The third point may sound obvious but an example would be
the gamma-ray spectrometer which measures the gamma rays
from a volume that is a fl attened bell shape adjacent to the end
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