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With an alarm occurring, the operator should move the in-
strument while observing the display in order to localize the
position of the source. Please note that the alarm can occur up
to one or two seconds after passing the nearest distance to the
source.
If the function “NBR” is activated and the display shows “low
energy” after a few seconds, a low energy radiation source has
been found. Typical examples are radiation from medical
treatment, special nuclear materials as U-235 and shielded
industrial sources.
In case a radiation source has been detected, the radiation in-
tensity is indicated by means of the dose rate display (see
chapter 3.2).
4.7
Background
During operation in count rate mode with sigma
≥
2 the back-
ground radiation is always monitored and a smoothed, RC-
filtered value is computed. This value, limited to 200cps, is
used for the calculation of Alarm 1 if the sigma alarm activat-
ed. During sigma alarm the monitoring of background is sus-
pended.
On acknowledgement of an alarm 1, the background ratemeter
is set the actual count rate and continues learning.
Please refer to ‘Flow Diagram Background Learning &
Alarming’ in chapter 12.2.