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2.3. Setup for Rad and Flu Under Table Measurements

The Piranha Dose Probe detector surface facing downwards for radiation coming
from under the table.

2009-09/1.0B

Piranha Dose Probe Holder User’s Manual

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Содержание Piranha Dose Probe Holder

Страница 1: ...Art nr 9644502 00 Piranha Dose Probe Holder User Instruction for GE Version 1 0B 2009 09 ...

Страница 2: ...his manual is valid for version 1 0 of the Piranha Dose Probe Holder Copyright 2008 2009 by RTI Electronics AB All rights reserved Content of this document may not be reproduced for any other purpose than supporting the use of the product without prior permission from RTI Electronics AB Piranha Dose Probe Holder User s Manual 2009 09 1 0B Contact Information World Wide RTI Electronics AB Flöjelber...

Страница 3: ...ments 15 Appendix 1 Ion chamber energy correction factors for Cu 16 1 Important Notice for Field Engineers for Preventive Maintenance and QA 1 1 Introduction This short description is an addition to GE s own Operation Documentation for measurements on different type of modalities This description only refers to the operational documentation and does not cover measurements on other types of X ray m...

Страница 4: ...l be presented by a list of favourites In the screenshot below you see what such a list may look like in oRTIgo First make sure that you are in the correct favourite group and then select the favourite you wish to use for example IQST w PDP Rh Rh 30 kV 1 4 Radiography and Fluoroscopy Systems In all cases where the ion chambers have been used before the external detector should be used instead See ...

Страница 5: ...the external dose probe PDP then select the correct beam quality Mo 30 µm Mo and finally enter the correction factor as the beam correction factor found under settings If the correction factor is inserted there all dose data will be corrected For more info please consult the Piranha manual Table 1 IQST correction factors Radiation Quality Mo 30 µm Mo 3 mm Al PMMA IQST Mo 25 µm Rh 3 mm Al PMMA IQST...

Страница 6: ...is not detected by the dose detector since it is shielded and the energy dependence of the ion chamber Typically the backscatter is approximately 6 and the energy dependence may be as high as 8 To correct for the deviation and make the probes comparable this factor 1 14 in this example is added as a beam correction factor in the software1 This factor is already added in the favourites templates de...

Страница 7: ... opening Note that you will need to pull out the carbon pipe to make room for the Dose Probe to pass 2 1 Setup for IQST jig and phantom The Piranha DPH Dose Probe Holder is placed in the same position as the Radcal 6M chamber in the GE mammo IQST jig The edge on the shaft of the DPH should be placed right next to the clip Please note the pictures below indicating this position 2009 09 1 0B Piranha...

Страница 8: ...n radiography and fluoroscopy with the Piranha DPH directly on the table is shown below Note The Piranha Dose Probe is directionally sensitive thus the detector surface should be facing upwards for radiation coming from above the table Piranha Dose Probe Holder User s Manual 2009 09 1 0B ...

Страница 9: ... 2 3 Setup for Rad and Flu Under Table Measurements The Piranha Dose Probe detector surface facing downwards for radiation coming from under the table 2009 09 1 0B Piranha Dose Probe Holder User s Manual ...

Страница 10: ... rod extended to the maximum The detector surface may be directed upwards or downwards This is used when you do not want to have the aluminum part of the DPH in the x ray beam e g when you would not want the mass of aluminum material of the DPH driving up the mA or kV by the auto brightness mechanism in the system Piranha Dose Probe Holder User s Manual 2009 09 1 0B ...

Страница 11: ...nd the fork fit the DPH onto the stand Extend the carbon fiber rod to its full length and place it at the proper distance from the table top for fluoro dose rate measurements The holder can also be rotated 90 degrees for a vertical positioning of the Piranha Dose Probe 2009 09 1 0B Piranha Dose Probe Holder User s Manual ...

Страница 12: ...12 Piranha Dose Probe Holder User s Manual 2009 09 1 0B ...

Страница 13: ... radiography using the GE Standard jig and the Piranha DPH is shown below Note Remove the small locking ring and thread the large locking ring onto the DPH then fit the DPH into the jig and lock it in place with the small lock ring 2009 09 1 0B Piranha Dose Probe Holder User s Manual ...

Страница 14: ...ng the GE Standard jig and the Piranha Place the Piranha on the underside of the base of the stand and slide it into the GE jig as shown in the picture This is similar to the way the Keithley 35080 non invasive divider is placed in the GE jig Piranha Dose Probe Holder User s Manual 2009 09 1 0B ...

Страница 15: ...using the Piranha Dose Probe where the Radcal 180 cc is usually placed There is a specific rod used for the Innova setup Place the end at the end position of the rear clip to get it positioned in the central X ray beam 2009 09 1 0B Piranha Dose Probe Holder User s Manual ...

Страница 16: ... cc at RQC 5 70 kV and 2 83 mm Al 1 5 mm Cu a relative difference of 8 1 02 0 94 can be read out from the graph above An additional 6 is added due to the scattered radiation that is not registered by the Dose Probe In this case when comparing the two detectors the reading from the ion chamber will be 14 higher than the reading from the Dose Probe Piranha Dose Probe Holder User s Manual 2009 09 1 0...

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