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OPERATOR’S MANUAL • Owandy-RX DC • 02/2020 • NXDCEN160A
Operator’s manual – Owandy-RX DC
VERIFICATION OF THE
EXPOSURE FACTORS
9.1. VERIFICATION OF THE EXPOSURE FACTORS
In order to guarantee safety of the radiographic system, it is necessary to set up a periodic control schedule of the
exposure factors.
The RESPONSIBLE ORGANIZATION is required to organise and observe a control schedule of the exposure factors
as detailed in this chapter.
All the following controls must be performed every 12 months.
CAUTION
During these procedures X-rays will be emitted. Please take every necessary precautions in order to avoid accidental exposure to ionizing radiations.
STEP 1 – Checking the radiographic voltage (kVp)
The radiographic voltage is measured using a calibrated “non invasive” instrument.
SET TECHNICAL FACTORS
Vn ± 10%
NOMINAL VOLTAGE
3%
MAXIMUM VOLTAGE DROP
60 / 70 kV
NOMINAL HIGH VOLTAGE
4 / 8 mA
NOMINAL CURRENT
3,2 s
SET EXPOSURE TIME
The radiographic voltage is is 60kVp / 70kVp ±10%.
STEP 2 – Dose verifi cation (mGy)
The dose in air is measured with a “non invasive” instrument, by positioning the detector at a source-skin distance =
31cm (12”) (SSD) or 20cm (8”) (SSD).
SET TECHNICAL FACTORS
Vn ± 10%
NOMINAL VOLTAGE
3%
MAXIMUM VOLTAGE DROP
60 / 70 kV
NOMINAL HIGH VOLTAGE
4 / 8 mA
NOMINAL CURRENT
1 s
SET EXPOSURE TIME
