Dose in air is:
SOURCE-SKIN DISTANCE
31 cm = 12” 20 cm = 8”
70 kV – 8 mA = 5,5 mGy/s ± 30% 70 kV – 8 mA = 12 mGy/s ± 30%
STEP 3 – Checking the exposure time (s)
The exposure time is measured with a “non invasive” instrument.
SET TECHNICAL FACTORS
Vn ± 10% NOMINAL VOLTAGE
3% MAXIMUM VOLTAGE DROP
70 kV NOMINAL HIGH VOLTAGE
8 mA NOMINAL CURRENT
3,2 s SET EXPOSURE TIME
The exposure time measured is 3,2s ±5% or ±20 ms, whichever is larger.
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