Model 4404-16 Geo-Exploration System
Technical Manual
Section 1
Ludlum Measurements, Inc.
Page 2
April 2018
The Model 4404-16 electronics is mounted inside the detector enclosure and
is configured with a host board and four slave boards providing separate
radiation channels. The first channel is normally a gross counting channel
providing data on radiation energies from 20 keV to 3 MeV. The other
three channels can be set on selected regions of interest. For oil and gas
exploration, for example, the three regions are based on:
238
Uranium: 0.61 MeV
230
Thorium: 2.62 MeV
40
Potassium: 1.46 MeV
The waterproof enclosure is designed to protect the sensitive sodium iodide
(NaI) detector from damage. This detector is based on a scintillator crystal,
which is sensitive to thermal or mechanical shock. The enclosure provides
both thermal and mechanical cushioning to the detector. Use vibration
isolators when mounting the enclosure to a vehicle or other structure. Do
not subject the detector to rapid changes in temperature.
Summary of Contents for 4404-16-4
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