Fluke Biomedical 37-705 - Manual (Page 29)

VeriDose QC Phantom
General Description
3
3-1
Section 3
VeriDose QC Phantom
3.1 General Description
The VeriDose QC Phantom is a device that, in conjunction with the VeriDose V and the VeriDose Excel
Add-In, may be used for daily QC checks performed on radiation therapy machines (linear accelerators).
The VeriDose QC utilizes five VeriDose diodes positioned in an acrylic phantom to measure beam con-
stancy, flatness, symmetry and provide a depth dose check.
The VeriDose QC Phantom is configured for use in a standard 20 x 20 cm field. One detector is
positioned at the central axis and four detectors are positioned at 8 cm off the central axis in both the X
and Y axis (80% of field size).
The phantom may be positioned on its edge with detector +Y closest to the gantry for depth dose mea-
surements. In this mode detector +Y is located at a depth of 4.5 cm, detectors -X, central axis and +X are
located at a depth of 12.5 cm, and detector -Y is located at a depth of 20.5 cm.
The VeriDose QC Phantom is connected to the VeriDose V with a 15 m cable. The VeriDose V provides a
Flatness and Symmetry Report and an Energy Constancy (depth dose) Report based on the measure-
ment results using the QC Phantom. For further description of these features refer to the Setup Modes
QA Phantom section of the manual.
In addition, the measurement results may be accessed by a PC operating under the VeriDose Excel Add-
In. Graphs of beam constancy, flatness, symmetry and depth dose check are automatically generated.
For further description of these features refer to the VeriDose Excel Add-In manual (P/N VERIDOSEXL--
1).
3.2 VeriDose QC Phantom Specifications
Detector 5 diode detectors
Energy Range Photon: 4 to 25 MV
Electron: 5 to 25 Mev
Sensitive Volume 0.25 mm 3
Sensitivity 1.5 nC/cGy
Diode Polarity Negative
Rad damage @ 10 kGy < 15%
Operating Temperature 10°C to 40°C (50°F to 104°F)
Relative Humidity 5 to 95%, non-condensing