PTW 30013 - Page 27

Farmer Chamber
Ionization Chamber
Type 30010, 30011, 30012, 30013
Technical Manual - Technical Specifications
D596.131.00/05 en 27
Device designation Farmer chambers
ionization chambers, types 30011, 30012
Wall material 0.425 mm graphite
Area density total 79 mg/cm²
Electrode material T30011: graphite Ø = 1.0 mm
T30012: Al Ø = 1.1 mm
Build-up cap 4.55 mm PMMA
Rated range of use
Chamber voltage
Energy
Field size
Temperature
Relative humidity
Atmospheric pressure
Maximum operating alti-
tude
±(100 ... 400) V
photons T30011:
T30012:
(140 kV ... 50 MV)
(60 kV ... 50 MV)
electrons (10 ... 45) MeV
protons (50 ... 270) MeV
5 cm x 5 cm ... 40 cm x 40 cm (square field size)
(10 ... 40) °C / (50 … 104) °F
(10 ... 80) %, no condensation (max. 20 g/m³ absolute humidity)
(700 ... 1060) hPa
3000 m above sea level
Environmental conditions for
transport and storage
Temperature
Relative humidity
Atmospheric pressure
(-20 ... +60) °C / (4 … 140) °F
(10 ... 85) %, no condensation (max. 20 g/m³ absolute humidity)
(600 ... 1200) hPa
Connecting systems PTW-M, BNT, TNC