Farmer Chamber
Ionization Chamber
Type 30010, 30011, 30012, 30013
Technical Manual - Technical Specifications
D596.131.00/05 en 21
Technical Manual
3 Technical Specifications
Only values with specified tolerances or limits are guaranteed. Values without tolerances are for informa-
tional purposes only.
3.1 Farmer Chambers, Types 30010 and 30013
Device designation Farmer chambers
ionization chambers, types 30010, 30013
Manufacturer PTW-Freiburg
Application standard chambers for absolute and relative dosimetry in combination
with precision electrometers according to IEC 60731
Particular design characteris-
tics
– shell chamber (thimble chamber)
– vented
– type 30010: not waterproof
– type 30013: 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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