Cross beam calibration phantom: item catalogue number: PH-2-CR
Recent design - see the photographs above.
Height: 210 mm (+ 10 mm: a filler plug)
Inner diameter of the main part available for irradiation: 90 mm
Height of the main part available for irradiation: 130 mm
Width max (lower lid: stand): 130 mm
Polymer gel volume: approximately 1050 cm3
Some features of the phantoms:
- Phantoms (new design) equipped with a pressure-compensating valve*.
- Very easy to operate.
- Very easy to clean.
- For multiple use.
- The construction enables tight closure and the separation of a polymer gel dosimeter composition from oxygen.
- Transparent walls for observation of the irradiation effects in a polymer gel dosimeter.
- They are made of plastic. They can be scanned with MRI, CT or OCT.
*The pressure-compensating valve has been designed to compensate for changes of pressure inside a polymer gel dosimeter during and after the filling up of the phantoms, as well as during solidification of the gel dosimeter. Some polymer gel might shrink slightly during the solidification, storage or under ionising irradiation. The valve is intended to improve the performance of the dosimeters. The valve can be filled with an inert gas before or after the filling up of the phantom with a gel dosimeter composition (not obligatory). It can also be dismantled, if pressure compensation is not necessary.
For the Cross beam calibration, this phantom with a polymer gel dosimeter should be virtually divided into two or three planes perpendicular to the longer axis of the phantom. Then, for each plane, a plan of irradiation should be implemented such that beams of radiation cross each other. The crossed areas are used for the calculation of the Cross beam calibration equation. See also a movie: Software for 3D dosimetry/Calibration Workspace/Cross beam calibration. The calculation of the calibration curve and calibration equation can be performed with the aid of the polyGeVero®software (item catalogue number: S-2POLY-1).