Mirion Technologies GEM-5 User Manual

Chapter 6 Diagnostics/Maintenance
230
Table 15 Troubleshooting Guide
Fault Error Possible Causes Fix
Live Time error
1. Extremely high count
rate
2. Time counter failure
If LT = T – DT is < 0
then error
• Check source of
extremely high count
rate; detector light
leak, PMT, preamp
• Check computer
• Check Carrier Board
Detector contaminated
Large Background
increase
Contamination left
on detector or on
detector covering
• Clean detector
• Clean detector
coverings
High Bkgnd Rate
Background rate set
• Maximum Monitor
Time too low
• Scintillator light
seal failure
• Contamination on
detector
• High radiation
field
• Excessive noise
• Check all setup
values
• Repair detector light
seal
• Clean detector
• Shield or relocate
monitor
• Check discriminator
plot
• Adjust discriminator
level
• Replace detector or
Detector Board
Carrier Board Fault Failed board Replace Carrier Board
Sensor Board Fault
• Failed board
• Detector Interface
bus incomplete
• Replace Sensor
Board
• Replace ribbon cable
Scanning a badge has
no effect
Unable to go from
READY mode to
POSITION mode
Input device on the
monitor is not
working.
• Set Badge Reader
Enabled to “NO”
• Service input device;
replace if necessary

Mirion Technologies GEM-5 Specifications

General

Brand	Mirion Technologies
Model	GEM-5
Category	Monitor
Language	English