Figure 2: Assay unit segmentation and corresponding coordinates treated with 80 MeV/u 12C6+ irradiation in a 10-mm diameter window.
From: Three dimensional approach to investigating biological effects along energetic ion beam pathways

(a) Cylindrical cross section; (b) Assay unit segmentation and corresponding coordinates. X1, radius of the cylinder core area; X2-6, cycle thickness mean of an assay unit in the cylinder.