SAIC Exploranium – GR-135 System Manual page: 51
d) POWERING ON WHEN NOT in DS – normally the GR135 needs to
be in the DS when not in use. System parameters normally require
being in the DS at least once every 24 hours. If this time is
exceeded a special message is seen (see figure).
As noted on the display, users should place the unit IN the DS and
then the system will automatically adjust itself (minimum period ion
the DS = 2 minutes but longer is recommended for battery
charging).
A.6 SYSTEM USE
The GR-135 in the AUTOMATIC mode only operates in 2 modes – SEARCH and IDENTIFY
The SEARCH mode is used to search and locate radioactive material in vehicles, packages or on
people etc. The user can easily scan the suspect item and look for a significant increase in radiation
using the tools described in the SEARCH section below.
Once a source of radiation is found, the SEARCH mode is used to find it’s maximum point and then
the user selects the IDENTIFY mode.
As described in detail below, the IDENTIFY mode takes a sample (usually for 60 seconds) then
automatically analyses it and advises the user of the details of any radioactive material found.
A.7 SEARCH MODE
This special mode is used for searching for radioactive material. When the unit is removed from the
DS this mode is automatically selected
and the display shows the SEARCH display (see fig).
Data displayed are:
SEARCH – the function currently activated (i.e. SEARCH)
- a battery icon that shows battery status.
TOTAL – an operating mode set by the supervisor
1234 – this is the radiation level in cps (counts per second).
This level will always show some counts even if no
apparent radioactive material is present as this is the
local radiation background of an area. Typically in low
background areas, 50-100cps are common.
MEAS – shows that measurement is in progress
VS 2K – shows that the vertical scale on the chart display below is 2K (2000cps). This scale will
change automatically as radiation increases so the chart will always contain the peak
radiation
CHART DISPLAY – this is a chart display of the radiation data. The bottom of the chart is ZERO
cps and the top of the scale is automatically scaled. The display moves from left to right
so the LEFT hand data is the current data. The chart shows the last 120 samples and is
a very useful “view back” at the data making it very easy to see any significant radiation
increases. Note that the numeric cps data is not energy dependent so very small
changes of any type of radioactive material emitting gamma rays can be easily seen.
SYSTEM NOT
READY
PLACE UNIT IN
DOCKING STATION
WARMING UP
MEAS
VS 2K
TOTAL 1234
D.RATE
SEARCH
173
uR/h
PRESS ENTER TO IDENTIFY
500
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