6
Starting the Inspector
+
Before starting the Inspector
+
, install a standard 9-volt alkaline battery in the battery compartment in the lower rear. Note:
Place the battery against the bottom wall and make sure the wires are placed along the side of the battery and not under
it.
Start Up.
To start the Inspector
+
, set the top switch to the mode you want, and set the bottom switch to
On
or
Audio
. The
Inspector
+
then begins a 6-second system check. All indicators and numbers are displayed.
After the system check, the radiation level is displayed in the selected mode. Approximately thirty seconds after you start
the Inspector
+
, a short beep indicates that enough information has been collected to ensure statistical validity.
Display update.
In the dose rate modes, the numeric display is updated every three seconds. In Total/Timer mode, the
numeric display is updated twice a second.
Maximum level.
When the maximum level for the current mode is reached, the Inspector
+
beeps for three seconds,
pauses for three seconds, and repeats that pattern. The numeric display flashes. The beeping pattern and the flashing
display continue until the level decreases or the Inspector
+
is turned off.
Response Time (Autoaveraging)
. When the radiation level is less than 6,000 CPM, the reading in any of the dose rate
modes is based on the radiation detected in the immediately previous 30 seconds. In order to give a quicker response to
changes, when the radiation level exceeds 6,000 CPM in any 30 second period, the reading is based on the previous 6
seconds. When the radiation level exceeds 12,000 CPM in any 30-second period, the reading is based on the previous 3
seconds. Note: You can choose the 3 second response at any radiation level by using the Utility Menu detailed in Chapter
3. Refer to the following table.
After 30 second start-up
the reading will be based
if instrument is detecting
on an average of the previous
(<100 CPS)
30 seconds
< 6000 CPM or <1.75 mR/hr
(100 -200 CPS)
6 seconds
6000-12,000 CPM or 1.75-3.6 mR/hr
(>200 CPS)
3 seconds fast response
>12,000 CPM or >3.6 mR/hr
Autoranging
When radiation levels increases in some modes over certain preset levels, the Inspector
+
uses autoranging, automatically
changing to the
X1000
scale. Whenever X1000 is shown above the numeric display, multiply the displayed reading by
1000 to determine the radiation level. mR/hr,
µ
Sv/hr and CPS are not applicable.
Mode
Ranges as they are displayed
CPM
0 to 2,999 CPM
> 2,999
X1000
3.000 (3,000) CPM to 350 (350,000) CPM
Total/Timer
0-9,999 counts
> 9,999
X1000
10.00 (10,000) to 9999 (9,999,000) counts
Operating in Dose Rate Modes
Caution:
1. Be sure there is no obstruction between the detector window and source being monitored/surveyed. 2. Avoid
making measurements with the GM window facing the sun, it could affect your readings.
When the mode switch is set to
mR/hr
µµ
Sv/hr or CPM CPS
, the numeric display is updated every three seconds. At low
count rates, significant changes in the radiation level displayed can take up to 30 seconds to stabilize. For details, see
“Autoranging” in this chapter.
CPM (or CPS) and total counts are the most direct methods of measurement; mR/hr (or
µ
Sv/hr) is calculated using a
conversion factor optimized for Cesium-137. This mode is less accurate for other radionuclides unless you have
calibrated the Inspector
+
for a similar radionuclide.
The most immediate indicators of the radiation level are the audio and count light. It takes 3 seconds before a change is
shown on the numeric display unless you are using the Total/Timer mode.
Operating in Total/Timer Mode
When the mode switch is set to
Total/Timer
, the numeric display is updated twice a second and totaling starts.
Содержание Inspector EXP+
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