4544
NOMAD
X-ray Controls and Generator
Exposure time range 0.02 – 1.00 sec. (in 0.01 second increments)
Duty cycle 1:60 (one 1 second exposure every 60 seconds)
Minimum permanent filtration ≥1.5mm Al (0.8mm glass, 0.5mm Al, 0.2mm
plastic cap)
Output power 150W nominal at 60kV, 2.5mA
Generator rating 2.5mA (±5%) at 60kVp (±10%) direct current
(DC) output
Leakage technique factors 60kV, 2.5mA, 1.00 sec.
Maximum air kerma at handgrips and
control panel
<0.08mGy in 1 hour
Measurement Base of Technique Factors
Final performance measurements are made using a Piranha model 255 X-ray meter
from RTI Group or a Nero mAx model 8000 X-ray meter from Victoreen. Tube current
(mA) is sensed across a series connected resistor with an accuracy of ±1% and measured
using a digital multimeter, prior to encapsulation; the NOMAD Pro 2 has no provision
for external measurement of beam current after final manufacture. Exposure time is
measured during the entire exposure, references to 75% rise/fall, using the X-ray meter.
Collimator Cone
Minimum source to skin distance 21cm from focal spot to cone tip
Nominal dose output at cone tip (20cm) 3.41mGy/sec.
X-ray field size and configuration 6cm diameter circle
Backscatter Shield
Dimensions Ø158mm x 12mm thick
Attenuation ≥0,5 mm Pb ekvivalentti 60 kV jännitteellä
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