Measuring Setup - Siemens ARCOSKOP Troubleshooting Manual

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Correction factors:
DALI and NOMEX dose measuring device, large measuring chamber: 1.06
23 cm (9") I.I.: Grid correction factor:
WARNING

Measuring setup

•
The grid should be attached to the I.I.
•
Center the dose measuring chamber on the I.I. input screen and attach it.
NOTE
•
Attach 20 mm AL + 1.2 mm (4 x 0.3 mm) CU to the POWERPHOS radiation exit window.
NOTE
NOTE
NOTE
ARCOSKOP
System Manual
X-ray radiation!
See Chapter 1, Safety Information.
Use radiation protection. Wear a lead apron when making the
adjustments! Keep the fluoro time as short as possible!
Maintain a safe distance!
If a dose measuring device with a solid-state detector is used,
take care that the solid-state detector lies outside the dominant of
the dose rate control.
The dominant has a diameter of approx. 6 cm in relation to the
monitor screen.
The dose measuring chamber correction factor is not to be taken
into account in this case. The dose rates then result from:
[Dose rate at I.I. input (nGy/s)] * [Grid correction factor].
If the setting sequence described in Table 3 is followed, it is use-
ful to adjust the prefiltration of these types of operations before
setting the dose rate so that a tube current of approximately
0.3 mA to 0.6 mA is displayed on the console:
•
FL, full format, LOW
•
DR, full format, HIGH
•
FL, zoom format, LOW
•
DR, zoom format, HIGH.
The dose rate values that fall in between can then be set without
having to change the prefiltration.
If the dose rate value to be set cannot be attained, adjust the pre-
filtration accordingly.
To prevent inaccuracies, the measuring chamber of the dose rate
measuring device must be fully irradiated during setting.
For dose rate settings in Zoom format, the X-Iris is opened auto-
matically, so that the entire area of the dose measuring chamber
is irradiated.
SPR2-250.840.01
Rev. 01
Adjustments / Programming
Seite 16 von 42
09.05 CS PS 24
1.5
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