37 MN1007-C
7 Using the Instrument – taking a NORM measurement
Measurements of radioactivity at levels which are only slightly greater than background are subject to significant
statistical uncertainty.
A more precise result can be achieved by using the monitor in integration mode which allows counts to be
accumulated over a fixed time period.
The total accumulated count is then divided by the sample time to provide a statistically accurate, time averaged
counts per second (or counts per minute) or dose rate.
Operation:
1. Take background reading (required if using background subtraction modes only)
a) Move the probe to a location which will represent the background radiation datum point for the site and not
influenced by the source to be measured
b) Press Log Background
key as shown below
c) Wait until the red LED flashes. Press Rate/Int/Stop
to return to real-time rate display.
Figure 21 - Quick start guide to measurement
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General