Farmer Chamber
Ionization Chamber
Type 30010, 30011, 30012, 30013
Operating Manual - Application
14
D596.131.00/05 en
•
Connect the electrometer and switch it on.
•
Perform all necessary adjustments at the elec-
trometer. Verify that the high voltage is cor-
rectly adjusted.
•
Connect the detector.
•
Allow for a stabilization time of 15 minutes
before starting the measurement.
•
For absolute dosimetry: Determine the correc-
tion factor for the air density correction. If pos-
sible, set the correction factor at the electrom-
eter or note it down for the correction of the
measured value.
•
Pre-irradiate the detector.
•
Check the leakage current. The leakage cur-
rent should be low and stable.
•
Perform a zero adjustment.
•
Perform the measurement.
1.2
General Application
Information
The detectors are intended to be used with PTW
precision electrometers according to IEC 60731.
The detectors are used for dose and dose
rate measurement for the measuring quantities
'absorbed dose to water' and 'air kerma'. They are
applied in absolute and relative dosimetry or for
calibration measurements in air or in solid state
phantoms.
Only the Farmer chamber, type 30013, is water-
proof. These detectors are intended to be used in
a water phantom.
The black line on one side of the chamber stem
should face the radiation source during use.
NOTICE
To avoid damage to the detector, observe the
following points:
The wall around the sensitive volume is very
delicate and can easily be damaged.
Do not touch the wall with your hands or with
tools.
During storage, protect the chamber wall with
the build-up cap.
Handle the detectors with extreme care when
inserting them into adapters (for phantoms or
check devices) or removing them.
