Fluke Biomedical 90-12 - Manual (Page 13)

Calibration, Maintenance, and Troubleshooting
Calibration
4
4-1
Section 4
Calibration, Maintenance, and Troubleshooting
4.1 Calibration
4.1.1 Precautions
Only trained and qualified personnel operating within the protocols of an approved radiation protection
program should be permitted to calibrate any radiation device.
4.1.2 Standards
The 90-12 probe is calibrated at the factory against NIST traceable standards. The standard factory
calibration is to
137 Cs gamma rays. Calibrations other than to standard nuclides are available upon
request. The sensitivity of the probe is provided on the calibration documentation.
4.1.3 Factory Calibration Points
The probe is calibrated in conjunction with a survey instrument, and generally at 1/3 & 2/3 of full scale on
all survey meter ranges.
4.2 Preventive Maintenance
The probe should be kept clean and free from dirt and contamination. There is no other preventative
maintenance required. Remember to periodically have the probe recalibrated per the requirements of the
local radiation safety program.
The probe may be cleaned using any commercially available cleaning or decontaminating agent. While
the GM probe is sealed against moisture, care should be taken NOT to submerge the probe in water or
any cleaning agent.
Any attached survey instrument should be turned
off or the probe disconnected from the survey
instrument prior to any probe cleaning procedure.
4.3 Corrective MaintenanceITroubleshooting
Should the cable between the probe and the survey instrument be found to be frayed, immediately repair
or replace the cable.
If a probe stops counting, several possible failure modes are a loose connection or a broken GM tube.
CAUTION