Instruction Manual
DIAMENTOR E
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Further Information
[D151.131.0/3]
8
Further Information
8.1
Influence of Air Temperature and Humidity
As long as the DIAMENTOR E is used in the range + 10
°
C to + 40
°
C, the response changes
by less than
±
5 %.
If the DIAMENTOR E is used in environments with high humidity (for example 30
°
C, 75 %
relative humidity), a film of moisture might cover parts of the instrument or chamber and can
cause an increase of the leakage current (see chapter 8.2).
If such a leakage current is observed, the DIAMENTOR E should be placed for about 24 hours
in dry warm air with a maximum temperature of 50
°
C. It is advisable to carry out such a
drying procedure after each transport over longer distances.
8.2
Checking the Leakage
The reading of the DIAMENTOR E may be affected by leakage current. If a not irradiated
ionization chamber causes a reading on the display, leakage current most probably is the
reason.
A check for leakage is carried out (preferably over night) by leaving the instrument switched on
and having the chamber connected but not irradiated. Not more that one digit per hour should
appear (see also chapter 9).
8.3
Influence of Field Size and Dose Rate
The smallest current is delivered to the DIAMENTOR E when the chamber is used with the
smallest field size and the lowest exposure rate.
The greatest current is delivered to the DIAMENTOR E when the chamber is irradiated with
the largest field size and the highest exposure rate. In the range from 100 cGycm²/h to 30,000
cGycm²/s, the response changes by less than
±
5 %.
