Operating In Total/Timer Mode; Taking A Timed Count - Radiation Alert Inspector + Manuel D'instructions

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 µSv/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.

Taking a Timed Count

When a timed count is taken over a longer period, the average count per minute
is more accurate, and any small increase is more significant. For example, if one
10-minute average is one count higher than another 10-minute average, the
increase may be due to normal variation. But over 12 hours, a one-count
increase over the 12-hour background average may be statistically significant.
The Inspector+ can give you a total count for a timed period from 1 minute to 24
hours. For a timed count of less than one minute, watch the seconds countdown
on the display. You can manually shut off the timer at any point.
Follow these steps to take a timed count:
1. With the Inspector+ turned on, set the Mode switch to Total/Timer and the
timer switch on the end panel to Set. The timer Hourglass and the SET icon
appear on the display and the value is set to 00:01(1 minute).
2. Use the "+" and "-" buttons to adjust the timing period. The timed period can
be set for 1 to 10 minutes in one-minute increments, for 10 to 50 minutes in
ten-minute increments, or for 1 to 24 hours in one-hour increments.
3. Set the Timer switch to On. The Inspector+ beeps three times and starts
counting. The hourglass icon flashes during the timed period.
If you want to see how many minutes remain, set the Timer switch to Set.
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