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The Edge™ Detector is an all new detector suitable for in-water and
out-of-water small field dosimetry. The Edge Detector was designed to
eliminate the dose volume averaging problem associated with ion chambers for
small field and high dose gradient dosimetry. Ideal applications are all
types of beam scanning for field sizes smaller than 20x20 cm2. FDA 510k
(k051921) approval has been received.
The Edge detector measures true open field output without the
distortion effects of an ionization chamber. All ion chambers suffer from
Dose Volume Averaging, which is the averaging of dose along the penumbra.
This effect is particularly troublesome in IMRT fields and small open beam
fields. An Ionization Chamber’s sensitive dimension is larger than our Edge
detector’s sensitive dimension. As the ionization chamber approaches the
beam edge, the front of the chamber moves into the penumbra while the back
is still in the open field, thereby dulling the edge of the beam. The ion
chamber averages the dose along the penumbra creating a measured penumbra
that does not reflect the actual delivered penumbra. This ultimately results
in compromised treatment planning due to improper dose modeling data.
Compared to the smaller scanning chambers, the Sun Nuclear Edge detector
gives you approximately 40 times more signal in about ¼ the size. The Edge
adds up to smoother profiles, sharper resolution, and the REAL picture for
your planning system.
The detector is water proof. The top surface of the detector should be
perpendicular to the incident beam axis, with the cross aligned to the beam
center. Edge II detector has a 1.9 mm circle opened at the center of cross
on the top of the brass housing, as indicated by the yellow painted circle.
The opening hole is sealed with epoxy, and shield with nickel dag (~
0.05 mm thick).
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Effective detection area |
0.8 x 0.8 mm2 |
| Buildup thickness (top-to-active region) |
0.3 mm |
| Effective buildup thickness
(top-to-active region, and calculated from electron density) |
0.5 mm |
| Detector housing |
0.13 mm tinned brass |
| External dimensions |
3.7 mm x 5.5 mm x 38 mm |
| Sensitivity |
32 nC/Gy |
| Impedance |
> 200 Mohm at 10 mV reverse bias |
| Output polarity |
Negative |
| Cable diameter |
2.5 mm |
| Cable connector |
BNC triax, or other types upon
request |
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