Sy
clone Portable Gamma-Ray Spectrometer, Revision 10 5.0 MANUAL MODE
Ra
dComm – Proprietary Page 38 Revision Date: March 3, 2016
OFF: This selection switches the audio meter OFF to disable the audio search mode.
e) ALARM THRESHOLD: selections are OFF, 100, 200,250, 300, 350, 400, 450, 500,
600, 700, 1K, 2K, 5K, 9Kcps
This selects a specified ALARM THRESHOLD LEVEL. When this threshold is exceeded
a special audio warning tone is heard.
f) SELECT ROI: selections are TOTAL, ROI1, ROI2, ROI3, ROI4
This selects the data used in the SEARCH mode. If TOTAL is selected then the display
will show TOTAL and the full spectrum data is used – everything above the lower
threshold of 20keV.
Any of the Region of Interest (ROI) selections utilize data ONLY FROM THE CHOSEN
ROI for the SEARCH mode. Settings for the ROIs are explained in Section 5.5.6. Thus
wit
h ROI1 at its default setting for Americium-241 – then if ROI1 is selected then only the
Americium data will be used for the SEARCH scan.
Note: Users are advised that, in most cases, using the TOTAL selection is
recommended as this selection gives you the highest count-rate and covers the
whole energy range of the system.
g) AVERAGING: selections are OFF, 3P, 5P, 10P
This selection permits data filtering. 3P = 3 point filtering – really a 3 point moving
average. So at a 1 second base sample rate the data will be displayed at a 3 second
average updated at a 1/sec rate. This makes the data chart display smoother and easier
to read but users are cautioned that averaging also reduces small peak amplitudes so if
the instrument is rapidly moved then small peaks may be missed.
OFF – raw data only, no data averaging
3P = 3 point averaging
5P = 5 point averaging
10P = 10 point averaging
5.5.2 STABILIZE
STAB PERIOD
Selections are OFF, 12H, 24H, AUTO
This parameter is used to advise users when
system re-stabilization is required.
OFF - The OFF parameter means that NO
WARNINGS are given to the user of when
a recommended stabilization is required.
Users are advised that although the
temperature correction is quite accurate
under some special conditions the
accuracy of the correction may be
inadequate. The rule of thumb is that if
during operation you get a “UNKNOWN
SOURCE”, “SHIELDED SOURCE” or “BACKGROUND” message then this it is
possibly
because the gain correction is a little off.
In
this case users are advised to stabilize the system and then repeat the
measurement. If the same message(s) is received again then this truly is an isotope
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