Mirion Technologies GEM-5 User Manual

Alarm Test vs. Occupant Alarm
Gem-5 User’s Manual 309
C. Special Information
Alarm Test vs. Occupant Alarm
There are two cases to help compare Alarm Test mode versus Occupant Alarms:
1. Monitor does not pass Alarm Test but does Alarm for Occupant.
2. Monitor passes Alarm Test but does not Alarm for Occupant.
Case 1
Monitor Does Not pass Alarm Test but does Alarm for Occupant.
1. Check F3 – Setup, F3 – Detection Zones, F2 – Settings – Self Shield Factor -
Alarm Test.
a. If source is held on end of a stick then there will be minimal self
shielding.
b. If source is held by operator then operator could be contributing self
shielding.
2. Check F3 – Setup, F3 – Detection Zones, F7 – Alarm Test Settings – Alarm Test
Type. If set to “Alarm Test” then sum zones are not checked and a source
between detectors may not alarm. (Set Alarm Test Type to “Coverage Test” if
testing between detectors).
3. Check F3 – Setup, F1 – Common Values – Count Gamma Body in 2 Steps
settings. In Alarm Test mode these detectors need to be counted twice to get a
contaminated result, (current reading is added with previous reading to get
required count time).
4. Confirm that F3 – Setup, F8 – Printout – Auto Save Alarm Test Results is set to
“YES”.
5. After doing an Alarm Test mode sequence with unexpected clean results, look
in D:\MonitorProgram\DATALOG for RESULT yyyymmddhhmmss
AT_.TXT files. Examine these files looking at the detectors that were expected
to alarm to see why they did not (Skip flag, low gross rate, high background
rate, etc.).

Mirion Technologies GEM-5 Specifications

General

Brand	Mirion Technologies
Model	GEM-5
Category	Monitor
Language	English