Routine and Preventive Maintenance
Gem-5 User’s Manual 357
• To clean the screen, lightly dampen a soft, clean cloth with a cleaning agent.
If possible, use a special screen-cleaning tissue or solution suitable for LCD
screens. Do not use benzene, thinner, ammonia, abrasive cleaners, or
compressed air.
• Do not press or rub on the sensitive display surface.
• Since the front polarizer or a touch layer (if installed) is easily damaged, pay
attention not to scratch it.
• When the panel surface is soiled, wipe it with absorbent cotton or other soft
cloth.
General Daily Cleaning
For the GEM-5, a daily cleaning of the floor pan and a periodic
cleaning/decontamination of the inner and outer surfaces will insure long-term
trouble-free operation. Cleaning frequency requirement depends on the local
conditions and number of monitoring cycles abd should be adjusted accordingly.
Decontamination
The monitor chassis and frame are made of powder-coated painted steel. Surfaces are
smooth to minimize the likelihood of contamination buildup. The floor section is
made of stainless steel, and floor pan of aluminum (to reduce attenuation for the foot
detector). In the event that decontamination of the monitor surfaces becomes
necessary, standard decontamination agents may be used.
It is of primary importance to determine the type, location, and distribution of any
radiation before decontaminating. Although unlikely, it is possible for the equipment
to mistake interference from background for contamination, if the background
interference is streaming or tightly collimated (X-ray beam, active waste drains,
leakage through shielding, etc.). It may be necessary to relocate the monitor to a low-
background area to facilitate accurate diagnosis.
Locate the contamination (the diagnostic screens may help) and identify the strength
or level of the particle/material. First, try to remove the contamination by a “dry”
method, using adhesive tape or a vacuum cleaner. After pickup, check the tape
adhesive with a frisker to verify if any contamination was picked up. Check the
location of the contamination on the monitor display to see if the level has been
reduced. If a vacuum cleaner is used, follow procedures as laid out by the radiation
control department for contamination pick-up. The rate meter screen in the Test
Menu may be useful for monitoring the contamination location during the cleaning
procedure.
If the initial attempt to remove the contamination fails, partial disassembly of the
monitor is preferred to “wet” decontamination. Remove the offending detector cover
and vacuum or use adhesive tape to pick up any lint that has fallen into the enclosure.
If all dry techniques fail, resort to “wet” decontamination practices as recommended
by the radiation control department. For wet procedures, it is recommended that
power to the monitor be switched off.
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