In External Beam Radiotherapy, transverse and longitudinal dose measurements are taken by a radiation detector in order to characterise the radiation beams from medical linear accelerators. Typically, an ionisation chamber and water phantom are used to create these radiation<unk> s. Water is used due to its tissue equivalence. Central Axis<unk>  for 15MV photon beam incident on water phantom. Here the linear accelerator collimation projects a 1x1 cm2 field at isocentre i.e. 100 cm SSD Transverse dose measurements are performed in the x (crossplane) or y (inplane) directions perpendicular to the radiation beam, and at a given depth (z) in the phantom. These are known<unk> s. Dose measurements taken along the z direction create radiation dose distribution known as a depth-dose curve.
Dose profile
Epidemic curve
Regimen
Case fatality rate
Safety pharmacology
Dose area product
Reference dose
Toxicity category rating