Instruction Manual MIC type EC-912
Revision no.4
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f)
Dispose the tissues in a metal container marked "radioactive disposal". Leave the
container to the competent national authority for destruction when filled up.
g)
Never leave the source holder on the table after cleaning. Screw it into the MIC and
fasten the locking screw.
h)
Wash your hands after having cleaned the radioactive source.
Cleaning of ionization chamber:
Attention should be given to the fact that the insulating materials (polycarbonate
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) in the MIC,
especially the electrode support plate can be attacked by a number of liquids. So, it is highly
recommended to follow the procedure below. Modern cleaning techniques, such as ultrasonic, should
not be used. Furthermore, the amount of cleaning liquid should be kept to a minimum to avoid ingress
to the electronic housing.
For your information a list of liquids to which polycarbonate is claimed to be resistant, respectively not
resistant is given below. The list should not be regarded complete.
Polycarbonate is resistant to:
Alcohol (Ethanol)
Benzine
n-Butyl or sec-Butyl Alcohol (1- or 2-Butanol)
Cyclohexane
Acetic Acid, 10%
Polycarbonate is NOT resistant to:
Bases
Organic Solvents
Acetone
Chloroform (Trichloromethane)
Carbon Tetrachloride (Tetrachloromethane)
Toluene
Xylene
a)
Dismount the MIC housing by loosening the three screws around the holder for the
radioactive source and gently pulling the housing from the mounting plate.
b)
Clean the inside of the housing with paper tissues with a little alcohol. The radio-active
source shall be unscrewed and cleaned separately as described above.
c)
Clean the measuring electrode, the guard ring and the insulating electrode support plate
with paper tissues with a little alcohol, avoid excessive liquid.
d)
Allow the parts of the MIC to dry before assembling.
Assembling:
Be careful not to leave any fingerprints or other impurities on the internal parts of the MIC during
assembling.
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Brand names: LEXAN, MAKROLON