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 radia-
tions.
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
70 kV NOMINAL HIGH VOLTAGE
8 mA NOMINAL CURRENT
3,2 s SET EXPOSURE TIME
The radiographic voltage is 70kVp ±10%.
STEP 2 – Dose verication (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
70 kV NOMINAL HIGH VOLTAGE
8 mA NOMINAL CURRENT
1 s SET EXPOSURE TIME
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