0.3 cm3 Chamber

Model/Serial: 31003-939 (purchased: 1996)
Model/Serial: 31003-940 (purchased: 1996, defective: 2003)
Model/Serial: 31013-053 (purchased: 2003)

Description: Verified ionization chamber for absolute dosimetry. We use it with Unidos or Unidoswebline in the water phantom to calibrate linac dose output for photon energies.

Calibration History: Chamber 939 + Unidos 10396

Date NW U ppol (60Co) ps (60Co) NW' [Gy/C] Laboratory
26.03.1996 1.00 0.04 9.576E+07 PTW
20.05.1996 1.02 0.015 9.576E+07 BEV
03.08.1998 1.03 0.02 9.576E+07 BEV
08.03.2001 1.03 0.02 9.576E+07 BEV
03.02.2003 1.03 0.01 9.576E+07 BEV
05.04.2005 1.03 0.01 9.576E+07 BEV
29.11.2007 1.032 0.014 9.576E+07 Seibersdorf
21.04.2009 1.028 0.014 9.576E+07 Seibersdorf
27.04.2012 1.030 0.014 9.576E+07 Seibersdorf
15.04.2014 1.029 0.014 9.576E+07 Seibersdorf

Calibration History: Chamber 939 + Unidoswebline

Date NW U ppol (60Co) ps (60Co) NW' [Gy/C] Laboratory
20.04.2006 1.027 0.014 9.576E+07 Seibersdorf
13.06.2008 1.030 0.014 9.576E+07 Seibersdorf
06.09.2010 1.032 0.014 0.999 1.000 9.576E+07 Seibersdorf
27.04.2012 1.029 0.014 0.999 1.000 9.576E+07 Seibersdorf
15.04.2014 1.029 0.014 0.999 1.000 9.576E+07 Seibersdorf

60-Co calibration factors

Calibration History: Chamber 53 + Unidos 10398

Date NW U ppol (60Co) ps (60Co) NW' [Gy/C] Laboratory
12.03.2003 1.000 0.022 9.767E+07 PTW
14.04.2003 1.020 0.01 9.767E+07 BEV
20.04.2005 1.020 0.01 9.767E+07 BEV
22.02.2007 1.016 0.014 9.767E+07 Seibersdorf
20.11.2009 1.016 0.014 0.998 1.000 9.767E+07 Seibersdorf
27.06.2011 1.019 0.014 0.997 1.000 9.767E+07 Seibersdorf
16.04.2013 1.022 0.014 0.997 1.000 9.767E+07 Seibersdorf

60-Co calibration factors

Notes

60-Co calibration factors

Logbook

Date Event
26.03.1996 S/N 939 and S/N 940: initial calibration by PTW.
2003 S/N 940 defective, replaced by S/N 53.

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