Percentage depth dose curve

Of the low- dose curve (short TDK ) is understood in the context of the course of the radiation dose in the depth along the central beam. The depth dose curve, together with the transverse profile of a very important clue to the proper planning of the irradiation.

In the depth dose curve, the relative dose versus depth in water ( as gewebsäquivalent ) applied. In the diagram of the structure of the respective dose of radiation qualities, and their range can be seen. The maximum of the depth dose curve is determined by the average range of the secondary electrons from the surface layers of the irradiated medium and shifts with increasing photon energy in the depths. For prescribed in the clinical use of treatment planning systems regular constancy tests, among other calculated and measured depth dose curves are compared.

For the measurement of depth dose curves to use a water phantom.