ELECTRONIC PERSONAL DOSEMETER HANDBOOK
EPD/HB/40521/000
MAINTENANCE
ISSUE 5
Thermo
Page 79
SECTION 6
MAINTENANCE
This section describes the maintenance that may be required for the EPD.
Maintenance is limited to general cleaning, removing/replacing the EPD battery
and removing/replacing the EPD clip assembly. Limited maintenance can also be
carried to clear fault conditions and check the functionality of the EPD.
6.1 Calibration
The EPD is calibrated by a highly sophisticated automatic system consisting of
several radioactive sources. Calibration is performed during manufacture and is
expected to remain unchanged throughout the life of the EPD - provided the EPD
remains undamaged.
Thermo normal policy is to supply EPDs with the calibration factors locked to
prevent their subsequent modification, other than by Thermo. However where
expressly requested by customers in their purchase order, EPDs may be supplied
with the calibration factors in the unlocked sate. This is to enable such customers
to modify the calibration of these EPDs. In such cases the customers attention is
drawn to the following Disclaimer:
DISCLAIMER
The EPDs within this shipment have been calibrated using the factors as defined
on the supplied Calibration Certificate. As the calibration is NOT LOCKED Thermo
has no control over any subsequent adjustments made by the end user to these
factors. Thermo can therefore not warrant the calibration of these EPDs once they
have left the factory. As such, Thermo accepts no liability for the accuracy of the
radiological response of these EPDs.
EPD calibration may be checked using a Thermo irradiator, or by exposure to a
known radiation field, in a manner approved by the appropriate regulating
authority or local rules. It is recommended that calibration is checked annually.
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