ELECTRONIC PERSONAL DOSEMETER HANDBOOK
EPD/HB/40521/000
MAINTENANCE
ISSUE 5
Thermo
Page 89
6.4 Cleaning
The EPD is a sealed unit and has protection against dust and low pressure jets of
water from all directions. The unit will not withstand prolonged immersion under
pressure. Cleaning should be carried out if the unit requires general cleaning, if
the EPD battery has leaked or if the unit has come into contact with radioactive
contamination.
6.4.1 General Cleaning
The unit should be cleaned with warm soapy water. Use a neutral water-based
detergent, other detergents may damage or attack the EPD’s outer plastic
coating. A small brush should be used to clean any crevices in the case
moulding. After cleaning dry the EPD with a soft cloth. During cleaning, water
may enter the alarm sounder aperture. The sounder aperture is watertight,
although water ingress may deaden the alarm. Any water should be shaken or
blown out of the sounder aperture to restore the alarm noise level.
6.4.2 Radiological Cleaning
WARNING
DURING OPERATIONAL USE THE EPD MAY BECOME EXPOSED TO
RADIOACTIVE CONTAMINATION. THE EPD MUST BE SUBJECT TO ALL
RELEVANT DECONTAMINATION PROCEDURES LAID DOWN BY THE
RADIOLOGICAL PROTECTION AUTHORITY.
If radioactive deposits are present the unit should be decontaminated by carefully
wiping it over using a disposable cloth or tissue dampened with a detergent
solution and a small brush as described above, or alternatively by using a
disposable 'sticky wipe rag'. The unit should afterwards be checked with a
sensitive radiation monitor to ensure satisfactory decontamination has been
achieved.
6.4.3 Cleaning after a Battery Leakage
Any leakage of the EPD battery must be treated with extreme caution. In most
instances battery leakage will be confined within the EPD battery compartment.
Minor leakage (light smearing) may be removed with a proprietary cotton bud
moistened with a water-based detergent. However, if doubt exists as to the extent
of the leakage the EPD should be considered as unusable and the manufacturer
contacted for advice.
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