Detector Number
Gammas counted by
indicted Detector
Neutrons counted by
indicated Detector
Detector Number
Gamma Alarm
Level
Neutron Alarm
Manual Alarm
Reset Button
Detector Number
Gammas counted by
indicted Detector
Neutrons counted by
indicated Detector
Detector Number
Gamma Alarm
Level
Neutron Alarm
Manual Alarm
Reset Button
System Operation
Non-Alarming
When not alarming, the rad-D information panel displays the measured gamma counts per second and
measured neutrons per second for each detector in a repeating display cycle. If your rad-D system
consists of four gamma detectors, the display would show the gammas/second from detector #1,
indicated by the 1
st
LED light below the gamma count display being lit. Then the gammas/second from
detector #2 would be shown (accompanied by the second LED light being lit). The cycle would continue
with the gammas/second measured by detectors #3 and #4 being shown and then would begin again with
detector#1. A similar cycle would be shown if there were four neutron detectors. If you have a mixed
combination of gammas and neutron detectors, than the detectors would be cycled similarly to the
previous examples, except split between the gamma and neutron displays.
Alarms
During an alarm, the non-alarming detectors are no longer displayed. Instead the gamma or neutron
count of the alarming unit is displayed, with the specific detector identified by the detector number light. If
more than one gamma or neutron detector is alarming, the display shifts between the two. Both the
gamma and neutron counter displays are real-time. When the radiation source moves on, they will go
back to displaying normal levels. The Alarm Display Panel also has persistent alarm displays for gamma
and neutron alarms. These will not clear to normal levels until reset, either using the manual button on the
Alarm Display or via computer. The persistent gamma alarm displays the highest alarm level (1 through 9)
that a detector measured. The persistent neutron alarm indicates an alarm, but does not display a level
(any neutron source above natural background requires investigation).
