41 MN1007-C
10 Maintenance and Calibration
The NORM Monitor-IS has been designed for reliable operation in heavily industrialised environments and should
provide many years of effective service provided attention is paid to basic operational maintenance.
10.1 Cleaning
The NORM Monitor-IS features a thermoplastic handset and Geiger probe housing which are manufactured from
materials with excellent chemical resistance and inherent antistatic properties. The plastic cases may be cleaned
by wiping with a slightly moistened cloth. A mild detergent may be used if required.
The Scintillator probe is manufactured from stainless steel and phosphor bronze. The IP67 enclosure is designed to
be hosed down thereby facilitating decontamination.
Care should be taken to protect the cable termination plugs during the cleaning process.
10.2 Handling
Maintenance of the mechanical integrity and antistatic properties of the NORM Monitor-IS housing are critical for
use in explosive atmospheres. While the NORM Monitor-IS has a tough design, unnecessary impacts, abrasions or
contact with harmful chemicals should be avoided.
Tracerco recommend that the monitor and its probes are transported in a suitably robust transit case.
The user is advised not to open the NORM Monitor-IS or any of its associated probes.
The NORM Monitor-IS kit has no serviceable parts and should be returned to Tracerco in the event of
damage. It is essential for safety integrity, that repair of this ATEX certified equipment is carried out by
qualified personnel in accordance with the appropriate standards and regulations.
10.3 Calibration
All probes are delivered ready-calibrated; the calibration data being held in the probe itself and loaded into the
handset once connected.
In surface activity (Bq/cm
2
) mode the Geiger Probe (SA49) has been calibrated against traceable plaques of
known nuclides.
The Scintillator Probe (SA50) in dose rate mode is calibrated against a traceable Cs-137 source.
When measuring dose rates where the source is known to contain Ra-226, the displayed rate will be in the order of
30% below that from a Cs-137 source with the same activity.
Ionising radiation legislation recommends that all operational radiation measurement devices are subjected to
regular inspection and testing. This recommendation includes performance checks and where appropriate,
recalibration of the monitor.
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General