Dosimetry Phantoms

Dosimetry Phantoms

PEP Phantom Phoenix Electron Photon Water Phantom

The PEP Phantom has many applications and was originally designed for Electron Dosimetry to meet the requirements of the Electron Code of Practice; however it has also proved excellent for Photon Dosimetry. We have recently redesigned the PEP Phantom, removing all ferrous parts to make it MRI compatible.

The unit comprises a compact and robust water phantom complete with a levelling platform suitable for both chamber and treatment machine calibration / output measurements. It is capable of accepting all chambers recommended in the Electron Code of Practice.

The unique rotational chamber mounting, and the opposed thin windows, allow for measurements to be made with both vertical and horizontal beam incidence. Vertical chamber position is continuously variable. Lateral chamber positioning can also be easily achieved.

The ‘2611 Special PEP Holder’ Accepts both the NPL-2611 in its waterproof sleeve alongside the Farmer chamber in a vertical orientation at 2 cm from the external surface of the side window:

PEP Phantom Phoenix Electron Photon Water Phantom

PEP Phantom Phoenix Electron Photon Water Phantom

Specification

Material: 10mm clear acrylic
Internal Dimensions:

External Dimensions:

350mm(l)x294mm(w) x 300mm(d)
Thin Windows: 3mm clear acrylic x 150mm diameter420mm(l) x 400mm(w) x 390mm(h)
Range of Movements: Depth: 250mm with 1mm scale (continuously variable)

Lateral: 240mm in 10mm intervals

Levelling Capability: Three point levelling platform

Drain Hole:

Weight Empty: 8kg
Weight Full: 39kg
Acceptable Chambers: NACP, Markus, Roos, NE2571, NE2581,IBA IC70 and PPC-40, NPL2611 others upon request.

Ordering Information

The unit comes supplied with 2 chamber holders, one for the Farmer thimble chamber and the other for a parallel plate chamber of the customers choice. Additional chamber mountings available on request. Also available is the NPL-2611 Special Holder pictured above.

NE2566A Phantom

The NE2566A is a solid “Perspex” phantom for the calibration of Farmer cylindrical chambers (e.g. NE-2571) against a secondary standard (NPL Therapy Level system) by supporting both chambers in exactly reproducible geometries at the recommended depths in the calibration beam. It can be used for X and Gamma ray calibration over the range 150kV to 50MV.

NE2566A and NE2528

NE2528/3 Small Water Phantom

The NE2528/3 is a small portable water phantom comprising a strong “Perspex” (Polymethyl methacrylate) box containing a transverse tubular sleeve into which the 0.6cc Farmer Ionisation Chamber 2505/3 fits. The centre of the chamber volume aligns exactly with the intersection point of reference lines engraved on the beam entrance side of the box. A small sprung clip prevents the chamber moving during use. The useful energy range is 150kV to 10MV.

Dimensions

Internal Height 200mm
Internal Width 200mm
Internal Depth 100mm
Wall Thickness front 3.2mm
Beam Entrance
-Back
-Top, Base and Sides

12.7mm
6.4mm
Thickness of wall surrounding chamber thimble 4.6mm
Distance of wall surrounding chamber thimble 50mm (Water equivalent)
Weight Empty

Weight Full

1.5kg approx

5.5kg approx

NE2566A and NE2528

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