Myray 708G, Руководство оператора

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EN OPERATOR'S MANUAL
19
1.8.9. STRAY RADIATIONS
Stray radiation measurement is highly influenced by ambient conditions, such as wall composition and positioning,
therefore, under certain circumstances, the detected values can be significantly different.
The measurement points used are at 0.5 m, 1.0 m and 2.0 m, respectively, from a central rotation axis.
The circular measurement points are determined based on the patient bite position on the machine.
1) Standard panoramic exam: stray radiation measured at the maximum usage percentage allowed by the X-ray
generator (corresponding to an average anode power of 42 W).
Distance between rotation axis and measurement point
(Circular measurement points)
Stray radiation *
0.5 m 80 µGy / h
1.0 m 26 µGy / h
2.0 m 6 µGy / h
3.0 m 3 µGy / h
2) Standard panoramic examination: stray radiation measured at the current average usage percentage or based on 4
examinations per hour.
Distance between rotation axis and measurement point
(Circular measurement points)
Stray radiation *
0.5 m 12 µGy / h
1.0 m 3 µGy / h
2.0 m 1 µGy / h
3.0 m 0.4 µGy / h
Only for 3D machines
3) 3D standard resolution 10x10: stray radiation measured at the maximum usage percentage allowed by the X-ray
generator (corresponding to an average anode power of 42 W).
Distance between rotation axis and measurement point
(Circular measurement points)
Leakage radiation *
0.5 m 890 µGy / h
1.0 m 225 µGy / h
2.0 m 60 µGy / h
3.0 m 30 µGy / h
4) 3D standard resolution 10x10: stray radiation measured at the current average usage percentage or based on 4
examinations per hour.
Distance between rotation axis and measurement point
(Circular measurement points)
Leakage radiation *
0.5 m 65 µGy / h
1.0 m 20 µGy / h
2.0 m 5 µGy / h
3.0 m 2 µGy / h
* It is the maximum value at 15 cm above the horizontal plane of intersection with the patient bite. Other values on
the vertical axis are lower than these values.