4.2.2 The diode measurement with the Blue phantom (ScanditronixWellhoferDosimetric, Schwarzenbruc, Germany)
4.2.2.1. Setup Blue phantom
The Blue phantom2was setup and adjusted so that the phantom’s cross hairs in the X and Y direction are superimposed to the cross-hair of the light field at maximum field size and the intersection point of the cross-hairs is at the isocenter. After that waterwas filled to the phantom and SSD of 100 cm was set at the water surface. A spirit level was used for checking water level in x y and z directions. The leveling frame mounted on the top of the lift table was used to adjust in vertical and horizontal directions of the tank. Common Control Unit (CCU) was used to give the voltage supply to drive the detectors in the tank and also provide the connection between detectors and a PC with Omnipro-Accept V7.2 via the Ethernet cable.