Farmer Chamber
Ionization Chamber
Type 30010, 30011, 30012, 30013
Technical Manual - Technical Specifications
D596.131.00/05 en 25
3.2 Farmer Chambers, Types 30011 and 30012
Device designation Farmer chambers
ionization chambers, types 30011, 30012
Manufacturer PTW-Freiburg
Application standard chambers for the absolute and relative dosimetry in combi-
nation with precision electrometers according to IEC 60731
Particular design characteris-
tics
– shell chamber (thimble chamber)
– vented
– not waterproof
– guard ring
Measuring quantities air kerma and air kerma rate
absorbed dose to water and absorbed dose rate to water
exposure and exposure rate
equivalent dose and equivalent dose rate
Radiation quality photons, electrons, protons
Nominal sensitive volume 0.6 cm³
Effective point of measure-
ment (reference point)
on detector axis, 13 mm behind tip
Reference direction of inci-
dence
radial
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