A new state-of-the-art clinical linac facility was opened in November 2008 at the NPL in addition to the existing research linac facility.

The new machine is an Elekta Synergy Digital Linac with iViewGT portal and XVi 3D x-ray volumetric imaging that can be confi gured to deliver seven x-ray beam energies (instead of the usual maximum of three in any one hospital machine). This feature, together with the ability to provide up to ten electron beam energies, will enable NPL to provide absorbed dose calibrations for the full range of energies currently in therapeutic use in the UK.