Table 4.

Radcal chamber 10 × 6‐6 used for the DIAMENTOR meter calibration in the Siemens Artis zee fluoroscopic unit

Chamber 10 × 6‐6
Min rate	2 μR/s	20 nGy/s
Max rate	17 R/s	149 mGy/s
Min dose	10 μR	100 nGy
Max dose	59 kR	516 Gy
Calibration accuracy	± 4% at 60 kVp and HVL of 2.8 mm of Al
Exposure rate dependence	± 5%, 0.4 mR/s to 80 R/s, up to 500 R/s for 50 μs pulses
Energy dependence	± 5%, 30 keV to 1.33 MeV
Construction	Polycarbonate walls and electrode conductive graphite interior coating; 6.0 cm3 active volume