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75 cm3 SFD Diagnostic Chamber Type 34060

Shadow-free plane-parallel chamber for absolute dosimetry in diagnostic radiology

  • Shadow-free design for use with automatic exposure control / brightness control
  • Sensitive volume 75 cm3, vented
  • Suitable for measurements in front of and behind a phantom

The 34060 SFD diagnostic chamber is a general purpose, high precision chamber for measurements in diagnostic radiology. The chamber complies with the standard IEC 61674. Its shadow-free design makes it possible to use the chamber even while the automatic exposure control or brightness control is activated. Together with an adequate diagnostic dosemeter the chamber features a wide dynamic range for measurements either in front of or behind a patient-equivalent phantom. The length of the mounted connection cable is 2.5 m.

Type of product 75 cm
Application absolute dosimetry in diagnostic radiology
Measuring quantities air kerma, exposure
Reference radiation quality 70 kV, HVL 2.58 mm Al (RQR5)
Design not waterproof, vented
Direction of incidence perpendicular to chamber plane, see label ‘Focus’
Nominal sensitive volume 75 cm3
Nominal response 2.8 μC/Gy
Long-term stability ≤ 0.5 % per year
Chamber voltage 200 V nominal
  ± 400 V maximal
Energy response ≤ ± 2 % (50 ... 150) kV
Polarity effect ≤ 1 %
Reference point chamber center
Directional response ≤ 3 % for chamber tilting
  up to ≤ ± 15°
Leakage current ≤ ± 5 fA
Cable leakage ≤ 1 pC/(Gy·cm)

Materials and measures

Entrance window 0.6 mm polycarbonate,
  1.55 g/cm3
  0.002 mm graphite
  0.32 g/cm3
Total window area density 93 mg/cm2
Water-equivalent window thickness 0.9 mm
Sensitive volume radius 45.7 mm
  depth 2 x 5.71 mm

Ion collection efficiency at nominal voltage

Ion collection time 1 ms
Max. dose rate for ≥ 95 % saturation 0.78 Gy/s

Ranges of use

Chamber voltage ± (100 ... 400) V
Radiation quality (25 ... 150) kV X-rays
Field size (11 x 11) cm2 ... (40 x 40) cm2
Temperature (10 ... 40) °C
  (50 ... 104) °F
Humidity (10 ... 80) %, max 20 g/m3
Air pressure (700 ... 1060) hPa
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