ORTEC
®
Detective-EX/DX
®
-100T Portable HPGe Spectrometer — User’s Manual 931040P / 1014
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Patent pending.
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! Monitor Mode — Monitor Mode is used to identify radionuclides while moving relative
to object(s) of interest. In this mode, the Detective-EX collects and analyzes data in rol-
ling 8-second windows, making it particularly suited to situations where a completely
different set of objects may be presented to the instrument in that time period. An exam-
ple application is an ad hoc portal monitor where packages or people pass by the instru-
ment. This mode is also useful as a search tool where the instrument is carried by the user
in an effort to locate and identify a radioactive source. IDs persist until you tap to
acknowledge them; this ensures none go unnoticed.
! Search Mode — Search Mode makes it easy to find the areas of highest radionuclide
activity, that is, places where Identification Mode should be used. The display shows the
total gamma-ray count rate and total neutron count rate in each time period of the last 221
time periods in a rolling “strip chart” display. The time period is selectable. The neutron
count rates and gamma dose rate are also displayed. These strip-chart data can be saved
on disk in the ORTEC
.CHN
file format.
! SNM Search Mode
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— This mode lets you quickly sense the possible presence of
special nuclear materials
235
U and
239
Pu, even if other radioactive materials are present. It
Figure 1. Detective-EX Monitoring Modes.
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